This lesson introduces you to 8 science topics that are important in the cosmetic industry but are not usually covered in college course. It includes information about the following topics

  • Surfactants
  • Emulsions
  • Fatty Acids
  • Silicones
  • Polymers
  • Skin biology
  • Hair biology
  • Chemical Nomenclature

Download the slides

If you would like to download the slides, feel free to do so here.

When you’ve finished the lesson, please leave a comment and let us know what you think.

420 comments

  1. Rada

    Thank you! Nice presentation, short but informative.

  2. Marina

    Thank you, very useful

  3. Julie

    Absolutely fantastic and informative! Totally appreciate the information that you impart. Many thanks 🙂

  4. Rashmi Saxena Pal

    Being a pharmacy proffessional,I m aware of most of the terms,but the video is extremely helpful in quick revision of all these essentials.

  5. Olamide Olajide

    Thank you for the presentation. Like the first video, this one too is very informative. Looking forward to taking the course.

  6. Helene Tsangaris

    Hi Perry, I really enjoyed seeing your second video which has so many interesting facts to learn and will be looking forward to seeing the next one.

  7. Marile Hanson

    Great video as always. This is definitely a nose dive crash course. I personally was able to keep up because of my knowledge from esthetician school thankfully. I loved the structure of the course, made it easier to follow.

  8. Zohreh

    The video was so amazing. Thanks a lot.

  9. Tram

    A lesson is useful for me, thank you.

  10. Mariana

    Very interesting course! thank you

  11. su

    loved it very informative.

  12. Faith Chong

    Thanks for the presentation. Easy to understand and very informative.

  13. Kim Pelletier

    Thank you! Very interesting and helpful presentation. Looking forward to the next segment!

  14. Musbahu shehu Abubakar

    Thank you very much with this wondeful clip.

  15. Valence M

    The video stopped playing at 11:58, and i don’t why? I can’t move on to the next lesson without knowing the remaining information contained in more or less 10 minutes of the lesson. Help me fix the glitch.

    1. Perry Romanowski

      That sounds like a computer problem. Did you try rebooting?

  16. Hana

    Thank you perry, very interesting and informative video. Looking forward for the next classes

  17. Fatuma

    Thank you so much Perry, I was making my own beauty product for long time and I was thinking to take it to the next level. One day, I am looking forward to take your online practical lesson. Thanks again.

  18. Marta

    Thank you for this video. The INCI and IUPAC nomenclature comparing was really useful to me.

  19. Vesna

    Thank you very much for sharing your expertise in cosmetic chemistry.
    I like how you summarized the key purpose of most common raw materials used in making cosmetic products. It is very thoughtful of you to remind us all of importance not to go beyond the skin surface when manufacturing cosmetics……let that be the part of work and science for more skilled professionals, like doctors and chemist working in pharmaceutical industry. Looking forward video #3

  20. kloe

    Readed!! thanks so much!!

  21. Fredrick

    This is pretty good. What a good lesson.

  22. Rebecca Owens

    Another great video from Perry! I’m so glad I watched these videos, my path becomes clearer with each one!

  23. Gaspard

    Thanks for these interesting courses. They help me having a better understanding on Cosmetics. If I would like to access to literature related to home made ORGANIC cosmetics, what would you recommend ?

    1. Perry Romanowski

      See our course on creating natural cosmetic products.

      1. Juliana

        Where can I find this course on natural cosmetic products?

  24. mehrozkalim

    hi,,
    please help me ,, how to reduce viscosity of face wash and which chemical should i add to make it clear and transparent.???

    1. Perry Romanowski

      I would need more information about what is in your formula. I’d suggest you post the question in our forum.

  25. mehrozkalim

    Thankyou perry for the very informative video….

  26. Antonia

    Thank you for a very usefull presentation

    1. Ahmed

      Fantastic. This is interesting.

  27. Tanaya

    Wonderful information in series I have question how to mix glycerine with essential oils

    1. Perry Romanowski

      You can post questions in our forum.

  28. UB

    Hi Sir
    Thanks for the very informative session . Do you also do any car shine formulations?
    Top stuff

    1. Perry Romanowski

      No, I only do cosmetic products.

  29. BALSAM ALABASSI

    What I loved about this session is that it is done in simple terms with no information overload. Really well structured, thank you, Perry.

  30. Seema

    Very interesting and full of brief details for novice in this field.really excited for next lesson.Thanks for sharing.

  31. Izabela

    I found this video much more Interesting than first one. Look forward to next one.

  32. RITESH TRIBHUVAN

    Hi Perry, the information is really helpful and interesting. Iam into field of soaps & Cosmetics and would like to get more information on soaps as well specially syndet bar soap.

  33. Hieu

    Thank you Perry. This is useful video for me.

  34. Tanya

    Once again a concise yet informative video to help those with a strong desire to move into cosmetic formulation . I’m looking forward to the rest of this mini series

  35. BE

    This is very true, college does not prepare you to be a formulator. A lot is on the job learning

  36. Leonette

    Another excellent video. Very informative and relevant.

  37. Marian

    Great video!

  38. Asif

    Thank you so much
    It’s very helpful

  39. Daniela

    Oh you cosmetic chemists not following the IUPAC rules and making everyone’s lives more difficult. Also, each time silicones are mentioned, I think about protecting group chemistry. But from now on, I’ll look at the ingredients in my primers more carefully. Keep up the good work!

  40. Alex Ganczar

    Amazing. Love the information. The travelling part too.
    Walks you through important stages
    Alex Ganczar

  41. Alex Ganczar

    Amazing. Each video is very knowledgeable/ coaching is real good.
    Alex Ganczar

  42. Robin Pennell

    The information was well presented and easy to understand. I am not a beginner. It would have been great to have this introduction years ago. Robin 🙂

  43. Shally

    Hi Perry, Thank you for video. I am not scientist so difficult to understand science terms. I am interested to start make up production. Is that so what kind of scientist I need to hire especially in 2 way powders, make up, emulsion, make up removal, H2O facial water …Could you pls. advice? Note I live in Myanmar so nearest will be Thailand and if I do this business, I will hire Thai scientist. Thank you and look forward to you.

    1. Perry Romanowski

      Hello Sally – You need to find a contract manufacturer to make your product. Or you can look for a cosmetic formulation consultant. Check the IFSCC website for chemists in your area.

  44. Ijeoma odoko

    Thank you so much for your videos. They have really been insightful.

  45. Suzanne Van Coller

    Great information and can relate.

  46. haleh

    thanks for information. it is very useful.

  47. haider ali

    Thank you very much sir Perry.. thank you for sharing your useful and informative knowledge…

  48. Oc Dat

    Hello to all
    Has anyone taken the online course? The complete course? Please share with me. I am curious about this course. Thank you so much!

  49. Shawna

    These lessons have been great! Really interesting and laid out in a way that is totally comprehensible. I cannot wait to get to the next video. Thank you so much for the lessons!

  50. Jackie

    Thank you for making this information available, especially the “Naming Cosmetic Compounds” table, but also information regarding skin and hair; very interesting.

  51. chipo

    very informative

  52. Kiet

    Thank you so much for such a great overview. I really appreciate what you’re doing!!! Please Keep up the excellwent work.

  53. Odalys

    GREAT!! I really found these courses so helpful and interesting. Great job Perry

  54. Louise Mynhardt

    Thanks Perry, I have learnt so much from all your courses, please don’t stop.
    I have a question: what is the difference between Empicol esb3 (sles28%) and Texapon NSO. I hope you can help me, thanks Louise

    1. Perry Romanowski

      It’s just a difference in the amount of ethoxylation in the molecules. So Texapon has an average of 2 moles of EO per mole of lauryl sulfate. But when it comes down to it, you shouldn’t notice much difference in formulation.

  55. tu kieu

    Great information, Thanks a lot.

  56. Prototype

    Thank you for focusing on practical, applicable knowledge for formulators.

  57. Bayuning Kaeka Putra

    Nice lesson, Thank you Perry

  58. Bella

    Was explicit.. Thank you

  59. Maria

    A very good overview! Thanks for sharing Perry

  60. Cathy

    Lesson 2 was great to watch, especially for those of us (me), who don’t have a very strong much chemistry background.
    Thank you.

  61. JY Wu

    Useful and easy to understand for layman. Thank you.

  62. Manaza Mitha

    This was a very informative video that you put together for us. Thank you for helping me learn so much and enabling my learning in the industry. I look forward to future videos.
    Thank you Perry!

  63. Dr Mrs Rekha Sheth

    Excellent lesson – very lucid ans succinct even for a dermatologist like me! (from Mumbai, India)

  64. Haryanto

    I really enjoy the video and learn a lot from you. I am trying to learn cosmetic chemical since I learn very little in the university.

  65. Mattu

    Thanks alot for the useful video.

  66. Dorothy

    Thank you so much for this useful information!

  67. Wilson Anomah Opoku

    Nice teaching and God bless you.
    Please l need your help here, l made a detergent with the following ingredients:
    Hypochlorite – 1kg
    Sodium carbonate – 1kg
    Sodium hydroxide – 1kg.
    34lter bucket 2
    But its not thick
    which ingredient can i add to make it thick?
    Thank you.

    1. Perry Romanowski

      You need to add a thickener like Hydroxyethylcellulose

  68. Moonie

    Thank you for sharing these cosmetic knowledge. It’s very useful 🙂

  69. Choma Matale

    Hi again,

    Lesson 2 is fine especially for those who don’t have very little knowdge of chemistry. Thanks for making this information available.

  70. chinwe Agomoh

    This is awesome , thanks perry .

  71. michael

    Whaooo ! this is great and awesome. Thanks for the information really educative.

  72. olabowale

    Hi Perry,
    Thanks for the useful informations. You have really helped me understand so many confusing terminologies in the cosmetic industry, but i,ll still love to learn more.
    keep the lectures coming! Thanks .

  73. Tony

    Hey Perry,

    Thanks for posting such useful info , as a chemistry undergrad you continually remind me why I chose this field despite all the negative hype.

    Keep it up !!

  74. Chiara

    I studied most of the mentioned topics in my degree course that was specific for pharmaceutical products. However, there is always something new to learn: I didn’t know about the INCI dictionary!

  75. Sharon

    Interesting. Somethings I already knew from my biology & biochemistry classes. Helped pull them together.

  76. Jackie

    Thank you for this informative video. It is really very interesting!

  77. tina

    It is really helpful.

  78. Barbara

    Very informative, great lesson.

  79. Paige DeGarmo

    Super interesting video, especially the nomenclature part! I knew about a few of the ingredients from a food chemistry class that I took but I was really glad to learn about their application in cosmetics

    1. tina

      Thanks perry, its very interesting. I love it but I could not open the 1st lesson.

  80. Ayana

    Thank for the information! I haven’t found much information while I’m in school, so this is very helpful.

  81. Ching-Chung Tsai

    Very good lesson ! It help me to understand the ingredients name in cosmetic label.
    However please let me know where can I buy the dictionary of INCI and IUPAC.

  82. Spring

    Great lesson. Very helpful.

    Thanks for the video.

  83. Linda

    Very informative, thank you so much for sharing your knowledge and taking the time.

  84. Emily Chang

    Very informative and interesting. Thanks your sharing, Perry. It is very interesting. I look forward to receiving your next video.

  85. Marek

    Fantastic lesson

    Thanks Perry

  86. Simone

    Great info. I can’t wait for the next video!

  87. raymond

    dear sir

    thanks for this interactive session am looking forward for your next tutorials i want to make a lotion that is less greasy and of 80% water content.

  88. h.ghandour

    Thank you very much perry

  89. florence

    Wow this is really intestine and informative thanks so much for this great study.

  90. jorj

    Good think you

  91. ollie

    I am really enjoying the lessons, they are full of useful information and explained in very accessible language.

  92. Colin Ogle

    Useful background info that will no doubt be helpful as we go to the next lesson on beginning to formulate.

  93. Cristina

    Thanks for the video. It is very informative and interesting.
    Best regards

  94. kimone

    very informative

  95. Mustafa Hamido

    Waiting more information in next lessons

  96. Miguel

    Thanks for to impact this useful knowledge

  97. Quyen

    The lesson is very clearly informative. Thank you so much.

  98. Carla

    The second presentation was super informative. The list of the chemical nomenclature was by far super helpful. I will really start looking into them. Thanks!

  99. Kira

    This video is fantastic. Lots of essential information delivered in easy to understand language. Thank you!

  100. Amit Sharma

    Sir, where to buy polyglucose lactylate and gsb preservative in India. Please suggest me website names

    1. Perry Romanowski

      I’m sorry I do not know this information. I would suggest you do a Google search or check Alibaba.com

  101. hoàng

    a useful video. i am practicing make cosmetics

  102. Linda

    Very informative

  103. Mary

    very informative and helpful, thank you, appreciate all the knowledge your sharing with us peeps

  104. Irene Wong

    Quite useful.

  105. Pete

    Thanks Perry I nice video.

  106. chinthaka

    VERY USEFUL PRESENTATION

    THANKS

  107. Such a wonderful sharing of knowledge. Thank you and i look forward to more cosmetics as well as household (i hope you’ll also discuss) general cleaning concern.

    Cheers!

  108. Anna

    thank you very much! this is very helpful for cosmetic production start-up companies as ours. kudos for the project!

  109. kenul

    Thank you a lot. This programme is very useful…

  110. Esse

    Interesting course well done

  111. jime

    Thank you very much perry

  112. Antonios

    I really enjoyed this very informative lecture.

  113. Efia

    Great information as usual. I like the fact that these videos are long enough to keep my attention, but short enough for me to process the information and look forward for more! Excellent.

  114. Lydia Naadu Tawiah

    Thank you for the tips,i watched the first and second video it was great, i can,t wait to join your online courses,am interested in all your courses,
    your,s
    regards
    from Lydia

  115. kathy

    I love the video but it keeps on cutting off after about 7 minutes same with lesson 1
    Can you perhaps send another link. Thanks. Much appreciated.

    1. Perry Romanowski

      Sorry Kathy – I don’t know what the issue is. It is working for me when I test it.

  116. Nancy

    Thank you so much, I’ve learned a lot and now want to learn more! Please keep on teaching!

  117. nasir shaikh

    thnx for this valuable information n lessons

  118. Gloria

    I am an Account Executive in the cosmetic industry. This series of mini courses have been very informative. It has refreshed me to stay on top of the cutting edge of technology in the cosmetic industry.
    Thank you for sharing such valuable knowledge.
    Gloria

    1. Perry Romanowski

      Thanks for the kind words!

  119. Negar

    Hi, Tnx a lot for this video, but unfortunately is interrupted in 2:47 suddenly, I try it severally but every time is stopped in 2:47, How should I do? 🙁
    Negar

    1. Perry Romanowski

      Hello – Sorry Negar, I’m running the video right now and it works. I would suggest rebooting your system or try using a different web browser. I use Chrome and it works.

  120. Shantelle

    wow, why was it never explained like this. i can really recommend his course. it is simple and direct. no unnecessary
    details.
    i am not a chemist, i have not chemistry background and i understood this.

  121. Supriya

    Good information. Thank u sir.

  122. poopak

    Thank you Perry for the very informative course

  123. Lau C.S.

    Great insight

  124. Nisha

    Thanks Perry, this was of great help looking forward for your next video.

  125. DeAnn Jackson

    Thank you Perry for the very informative course! I will have to study that list, it will help me become a better esthetician! Thank you again!

  126. Iva

    Thank you! This is great!

  127. Pearl

    I’m an Esthetician and it was nice to get a refresher of what I learned in school a few years ago.

  128. JONES GYAMERAH

    GREAT Presentatation.very insightful

  129. YOMI NADINE

    very interesting, i really like it. thanks

  130. Lettie

    Very useful. Clearly presented. If hair is dead how come it stays without decomposing for many years?

  131. zohre khosravi

    thanks a lot,

  132. Maria Vargas

    Very helpful, THanks for sharing

  133. Samson

    Simple, easy to follow and very structured. Thank you for the great lesson.

  134. Ramsty

    Thanks for the helpful information.

  135. Daniel Segal

    Just a wonderful and effective lesson,

    You make Chemistry simple and easy for anyone to learn!

    Great job, and keep up the vids coming!

  136. Carolnee

    Very enjoyabe and easy to listen to and learn

  137. CAmyx

    Thanks for the informative video! I’m new to cosmetic science and enjoyed watching your video. The script and slides are helpful as I needed to go back to read and reference the notes. Thanks again!

  138. catherine robinson

    I miss the first video but I love the second videothanks a lot for allowing me to learn science chemistry scienceCosmetics

  139. uva

    Thank u very much Perry it’s very useful lesson for me and I’m waiting for more lessons 🙂

  140. Noel Peter Tan

    Definitely Organic Chemistry is a key to understanding cosmetic chemistry. Thanks a lot Perry.

    Nono

  141. Lara

    Thanks a lot perry!
    I love the hydrophilic heads 😉

  142. Julie Berry

    I enjoy re-learning some of these things that I remember from College chemistry. I started with soap, and have moved onto lotions, creams, and anything bath & body. Understanding all the various ingredients and combining them is amazing.
    Looking forward to seeing what you show us next.
    Thank you

  143. dalony

    Thanks very much .Its really interesting

  144. Nahid MM

    perfect!

    many thanks!

  145. Marie

    very interesting video, i have learned a lot of information that I can translate to formulating my own products.

    Thanks for sharing your knowledge

    Marie

  146. Ghazal

    Thank you vert much

  147. Annie

    another informative session of understandable information, I shall be waiting for no 3 many thanks

  148. Monika

    Hello Perry,
    I really appreciate your classes. I am a former cosmetologist and I’ve been makeing my own skin care products for years now. Recently I decided I wanted to share my products with others and start selling it. Just didn’t know where to start. I’m so glad I found your website. It’s is absolutely wonderful. And again, I can’t wait for the lesson # 3. Thank you so much for all your work.

    Monika

  149. Josephine

    Thanks Perry for your insightful video, very much appreciated as I am not a chemist but interested in making my own hair products.

  150. pat

    Thankyou x3, i’m not a chemist…yet! but your methods of teaching go beyond, really appreciated your input on the hair segment, as usual keep up the good work!!

  151. Leonard John

    Hi Perry,
    I found the lesson very informative and worthwhile, keep it up. however, I could not watch the videos for both lesson 1&2, it says ‘ File has invalid structure null’ please what do I do to watch the presentations?
    Thanks a lot

    1. Perry Romanowski

      Thanks Leonard. I would suggest trying a different browser. I’ve tested it and it works on my system.

  152. Margaret

    I really liked this episode because I like chemistry. Took me back to my olden days in the classroom :). Good explanations of ingredients one uses when making cosmetics. Slides and illustrations were good.

  153. Setty

    Great, very informative. Learned a lot of things about cosmetic science. Hope to hear more lessons about the cosmetic industry from you. Thanks

  154. RachaelZ

    We’ll put together and informative, thank you!

  155. Poorna

    Nice overview on the raw materials. It would be very helpful if you make a video on types of surfactants.

    1. Perry Romanowski

      I think we’ve done this on the blog. Do a search for surfactants.

  156. kay

    Very interesting. I’ll keep this information in mind. Thanks!

  157. kay

    Very helpful! thanks so much for this information!

  158. greg barton

    thanks for the information.

  159. Selda

    This is a great presentation. Thanks a lot. Are you going to mention about color cosmetics as well?

  160. gamra

    Good introduction to basic concepts. …can’t wait for more

  161. Karen

    Great video! You explain things wonderfully and make it so easy to understand. You have me interested in chemistry and now want to explore and learn more. Thank You!

  162. Irina Tudor

    Love the part about the fatty acids 😀 Great job, Perry, thank you!

  163. Lakisha

    This is a great introduction, and I like that it is simple enough for most with basic chemistry knowledge to understand. I think it is wonderful what you do to help educate others. Looking forward to the course.

  164. Patricia

    Great summary!

  165. JUDITH

    Perry,
    thank you for offering (free of charge) your mini lessons on Cosmetic Science! I have learned quite a bit of very valuable information as I begin the research phase of creating a line of branded cosmetics for our planned salons, which are about 2 years from launching! We want to learn as much as we can afford to pay for so that we choose the right company, ingredients, and formulations for our line! We are very excited and grateful to have found you and your website/blog…I can’t thank you enough for your graciousness in sharing your knowledge and expertise!

  166. hastizarei

    thanks alot, you help me alot.

  167. Maite

    Thank you so much! I don’t have a scientific background but do make cosmetics, so this has been very helpful!

  168. Chelsea Wreden

    Good info! ready for more!

  169. Anjali Gopala

    Hi ,
    I am new in cosmetic formulations., so it is really very useful for me .

    Thank You

  170. Noor

    Excellent Video. I have recently started a graduate role as a cosmetic chemist and I have to say that although I have done a Masters in Chemical Engineering, I am trying to grasp how to formulate cosmetic products. Its a lot more challenging than it seems especially because the environment is very fast paced and speed to market is very important with very little room for error. Anyhow, I am looking forward to your next video. I wish that you can give a more in-depth analysis of the various topics covered in this video. Do you know of any sources that I can go to for references? Thank you and Keep up the good work! The video was definitely great at clarifying key concepts in the cosmetic industry.

  171. allison

    Very informative. Clear concise and actually interesting. Thanks Perry

  172. farzaneh

    This video was so informative, thank you Perry

  173. dan

    Helpful
    I should have made notes

  174. Jose

    Focused and informative video on cosmetic chemistry principles.

    I enjoyed watching it!

  175. Lukman

    I thought studying chemistry is s waste of time. I think I now have a focus. U made it so simple to understand. Thank you so much.

  176. Hala

    Thanks A Lot ….. Its very useful information

  177. dean grillo

    great basic info that is always a big help. i appreciate your efforts in teaching. great stuff

  178. Aima

    Very informative, thank you for this.

  179. Johnny

    Great lesson that provide a better understanding about the substances used in cosmetics. Thank you.

  180. Sultana

    I found this video very informative. Can’t wait to view the next one

  181. arezou

    lesson 2 was great but where could I find lesson 1?!
    thank you

    1. Perry Romanowski

      You should have received an email that tells you how to get lesson 1

  182. Adnan Güzelsahin

    Very good avowed. Thank you Perry.

  183. Adnan Güzelsahin

    Very good and nice avowed. Thanky you Perry.

  184. Bomb

    Very good presentation, thank you so much

  185. Jasmye

    Your video helps a lot! I learn that I didn’t misunderstand what this course is about.
    But, do u mind to share more on the career studying this course? And where can I get a jobs after graduating from this course?

    1. Perry Romanowski

      I would suggest you look at our career articles (do a search for ‘career’ in the search bar). As far as where to get a job, I’d suggest you go through the SCC websites and look for listings.

  186. Bridgewell Nkosi

    How do I download the videos?

    1. Perry Romanowski

      These aren’t set up to download.

  187. hamid

    It is very interesting and reinforced my knowlegde in cosmetic chemistry.
    thanks

  188. Martins

    This is interesting particularly the naming but there is no INCIDENT name for carbon 19 none for fatty acid and alcohol. Is the omission intentional or we are to find out what they might be? I like the way you are trying to wet our appetite. I did chemistry in my college study you are right some of this topics are not mentioned.
    Thanks you Perry.

    1. Perry Romanowski

      C19 is not found in nature and is not really used in cosmetics so no one has bothered coming up with an INCI name. Probably would just use the IUPAC name.

  189. Mayra Gonzalez

    Excelent!

  190. Rosetta

    I started the class but I’m not sure if I’m doing the lesson right

    1. Perry Romanowski

      Are you seeing the lessons?

  191. vanessa

    WOW! THIS IS THE BEST EUCATION SINCE ELEMNTARY SCHOOL.
    THANK YOU, FOR YOUR GUIDANCE, LEADING THE WAY TO GROW AND CREATE SAFE PRODUCTS AS A COSMETIC CHEMIST.

  192. IDOWU

    Another informative and refreshing lesson. Well done Perry.

  193. Qamar-ud-din

    It is very informative. keep it up. I really appreciate your efforts for equipping the chemists for an important industry in very interesting way

  194. Angel

    It is very interesting and reinforced my knowlegde in cosmetic chemistry.
    thanks

  195. monicca

    Very good presentation…, thank you, Perry!

    1. Perry Romanowski

      Thanks!

  196. L.A.

    Very informative.

  197. Marveline Oconnor

    Extremely informative .
    Thank you

    1. jokonia

      you are doing great keep up man.

      1. Perry Romanowski

        Thanks!

  198. maitree kanjilal

    Thanks a lot. Where is part 1?

  199. Mohammad

    Thank you very much perry

  200. Amanda de Nobrega

    Thank you very much for the lesson! I learn a lot from it, now will be easier for me to understand the practical.

  201. Traci

    Thank you Perr for your generosity. This course and cross reference chart are very helpful.

  202. Phirdy

    Very informative – I’ve certainly learned a lot! Thank you for you time and efforts. Appreciated

  203. Fred

    Impressive information well presented, and up to date tips. Thanks for an excellent presentation.

  204. Sharon

    Thanks, good job again.

  205. Saadat

    Thank you so much for providing this stellar service.

  206. amensah

    Another great course.

  207. Joyce

    Excellent information, very good description of ingredients. Thank you.

  208. mia

    Many thanks for sharing, really informative.

  209. Lynn

    Thanks for the info. I’m not a chemistry student, just a regular person! LOL
    Looks like I am in need of a cosmetic formulator in the Portland, Oregon area. Any suggestions?

    Thanks again

  210. Than Htaik

    Very nice, educational, helpful to beginners, thank you

  211. goumenaki

    a really nice introduction in cosmetic chemistry!!!good job indeed

  212. satish

    This is a really good learning for me in presentation way, i will be waiting for the next lesson to know more…

  213. Chikondi

    Thanks for the mini revision and intro into the raw materials essential to cosmetic science. It is very practical, and specific to the industry. A review of my college notes is definitely necessary to get a reminder of the terms. And thanks for the power point slides too!

  214. sola

    Hi Perry, i cannot access and save this particular lesson 2, It’§ showing page not found, can it be corrected?. i really need this information. Thanks

    1. Perry Romanowski

      I fixed the link. try it now

  215. Maria Miller

    Thank you soooo much! I am new to the industry and the information you presented in the video are the things that needed to know. Thanks for pointing out the things that i need to commit to memory also. very helpful.

    Maria

  216. Ashley

    Around 1:54 you state that the surfactant molecule has a hydrophobic head but the screen shows hydrophilic head so I think that was what you meant to say. Otherwise, great lesson!

    1. Perry Romanowski

      Thanks for the edit!

  217. Kallia

    Great mini course. I am a chemist and your lesson directs me in to which topics do I have to give more emphasis in order to be a cosmetic chemist. I am looking forward for lesson 3

  218. Anne

    Many thanks for all this information. Very useful. I love this website, really. It helps me a lot.

  219. Ramachandra K S

    Hi Perry,

    Excellent treatment of the subject with nice visual feast! Keep it up.
    Regards,
    Ramachandra

  220. Merryl

    Thanks again Perry. Great info into the vast vast world of cosmetic chemistry. Got my pen ready for the next 2!

  221. Atif

    Good Perry. You have given me good source of information. I have learnt well.

  222. Zahra

    Hi Perry, thank you for this excellent overview of important cosmetic science topics. Very well explained.

  223. Solange Peretti

    If I watched your videos before start to work developing products, I probably didn’t suffered to know this things… anyway, now I can tell you , this is a good way to let , students in college that intend to follow a cosmetic career, know and feel a little bit more familiar with the ingredients.

  224. Lorelie

    This is a very informative minicourse. thank you.

  225. Ana

    I think now I can better understand the list of compounds that appear in cosmetic labels.

  226. sima

    Thanks. It’s really a great information .

    I am very excited to see Lesson No ,3

  227. eucalypta

    I wonder what the target group is, that you’re aiming at.
    As far as I know, the major part of the presentation should be basic knowledge for those who have chosen science in (European) highschool.
    But it may be a good refreshment course and the nomenclature overview is a handy flashcard.

    1. Perry Romanowski

      Most people coming out of college do not get exposed to this information about the primary ingredients in cosmetic products. You would be surprised at how unprepared people can be.

  228. David Small

    Very clear and precise introduction to cosmetic science, any plans for a more advanced seminar?

    1. Perry Romanowski

      You can get that in our training program.

  229. Eng. Nabil Mijahed

    Tghank you for the free informations
    Realy you are professional in this feild
    Appreciate highly your lesson 2
    Best regards
    Nabil Mijahed

  230. Tina

    You are highly appreciated for the useful info. More grease to your elbow

  231. Tron

    Thanks for the free information. This website is full of helpful resources.

  232. yohan

    Hi Perry, It was a good information for me. I am looking forward to part 3. Anyway do you have any fixed formula for cosmetic (skin care, hair care, lotion etc) for testing ?

    1. Perry Romanowski

      Do a search on our website for Free Cosmetic formulas

      1. yohan

        Thank you…!!

  233. Nelly

    Thank You Perry for this insightful information. I’ve learned a lot from this lesson just as much from lesson one. You are a great tutor. Please keep it going.

  234. Mónica

    Thanks for providing information for free

  235. Gladys

    Dear perry
    thankyou very much for the info.Its really insightful

  236. Gloria

    Thanks alot! The bit about the nomenclature was very informative. Now I see the link. Thanks again Perry!

  237. jones appiah

    Hello perry,
    thanks for this brilliant pieces of information. These are not taught in training courses.

    1. Perry Romanowski

      Your welcome. I tried to make these unique and useful.

  238. Kathie

    Great concise information. Thanks. Looking forward to no 3!

  239. Zenith

    Thanks for this great presentation, now you entice me to learn more about cosmetic science

  240. Mary Udoh

    Thanks Perry, I”m finding this so interesting.

  241. Alya

    it was useful,but I guess I need more regarding the nomenclature part,I guess I’m going to buy the INCI 🙂 .

  242. Samorn

    Your lesson 2 has been very informative, Big thanks for sharing.

  243. Jeannette

    Hi Perry,

    Thank you for the information that you provide. It is very useful and easy to understand especially for myself as I am a beginner and have lots to still learn. I am looking forward to course 3. Once again thank you!

  244. Ravindra

    This is a really good lesson

  245. Becky

    Wow, that was really interesting. I miss my chemistry class! It’s been too long. 🙂

  246. Colleen

    Thanks Perry, very informative & well-explained.

  247. wesley

    this kind of vedio is really what i want because i am a newer

  248. somchai

    It is a good lesson, easy understand.

  249. Stefania

    Very interesting!!Specially when you talk about the INCI names!Thank you very much

  250. Dawn

    Hi Perry!
    Great information in an easy to understand format. Keep up the great work!

  251. Gill

    Hi Perry,

    Another great summary, again with very useful information. Thanks for sharing your expertise.
    I am looking forward to seeing the next lesson!

  252. R M Hegde

    Thank you, very simple to understand.
    Sir, i am developing a simple face wash with SLES, Carbomer, Glycerine , PG, Aloevera,MPS.PPS and TEA as neutraliser. pH- 7. 0 to 8.0
    Iam facing the problem that when neutralized the gel, excess air bubbles will be trapped in side . Pl. suggest any changes or method or any equipment to remove the excess air bubbles from the gel. Pl. suggest which is better for for face gel- SLES or SLS

    With regards and thanks,
    R M Hegde

  253. Ghassan

    Thank you for this information Mr. Perry, but I have wondered if allowed:
    1 – Is it possible to get a file documenting this information with percentages allowed for each material used in combination?
    2 – Can I squint chemically sodium silicate to (a) the simplest possible way so as not to provide this silicon in my country now?

  254. caleb kim

    great overview,thanks

  255. Irma

    Hello Perry,
    Ten stars for you Perry, great summary,very useful info.Thanks again for sharing your expertise.
    I am looking forward to the next lesson.

  256. Rabia

    Hello sir!
    your this information is very useful…
    u deliver the lecture in very effective way and its easy to understand everything..thanks

  257. Jessica

    wow I was really surprised to learn that the IUPAC format of nomenclature is not used in cosmetic chemistry, very insightful video.

  258. Sheng-Sung Yu

    I truly learned from the lesson because there are many aspects in cosmetic science that I didn’t know. I have heard those terms in college but I have never learned the application to cosmetic products.

  259. R M Hegde

    I really appreciate you for your effort to share your knowledge of cosmetics through simple way

  260. Eltoum

    hi
    I think I can say I agree with all of the above comments

  261. Mehbuba

    Excellent….keep it up….

  262. Efi

    Thank you Perry for these free mini courses. A lot of information gathered together in good order. A very usefull tool for the beginners, since, as you said, very little information about these molecules is given in the University. When I started working in the cosmetic industry a few years ago, I found it very difficult to understand what to do with all these raw materials!! I am also very glad to have stumbled upon your website and I will keep following your work and your articles. Unfortunately, not many people are so generous to share their knowledge.

  263. Sherry

    very useful source! thanks

  264. Nicole

    great overview

  265. Deeqa ali

    This was very insightful

  266. wael

    your coarse is very useful & help me more,
    Although my knowledge in cosmetic is somewhat is good,
    but i learned more from your minicoarses

  267. Anne-Laure

    Hi Perry,

    your course is very interesting, thank you very much

  268. Joshua

    I second you Mo.

  269. mo

    Hi, Perry
    I believe those they want to become cosmetic chemist they should follow these lectures seriously and in mean time these well arranged presentation are a short review for those they already know the basic principle of cosmetic chemistry.

  270. Joshua

    Just finished with video two and say three thumbs up Perry. Great presentation.

  271. Maria Dela Cruz

    This is a great course for people who would like to be a formulator in the industry. Thanks for sending us an informative course like this.

    Maria

  272. Manish

    Nice one.
    Would like to see more on INCI name.

  273. Cindy

    Dear Perry

    Thanks for the chemistry lesson which reminds me of old school days when I had my chemistry classes. Although I do not have intention to become a chemist, I find it extremely good knowledge to get a foothold of the industry. I am very glad to have stumbled upon your website.

    1. Perry Romanowski

      Thanks for the kind words.

  274. Dhananjaya

    it is very useful information given,
    thanks

    regards
    Dhananjaya

  275. Kate

    Hi Perry

    That was totally great! Thanks, btw, for making slides available as a PDF. I’m more of an IUPAC kind of girl with oil lab experience and a bunch of books buried in a sea can. So that list is now saved. There is a lot to know about chemistry, and you can’t possibly remember it all- well I can’t! You get familiar with the things you work with every day and start forgetting the stuff you don’t use so thanks for that. I see what I need to learn and also what I need to review or re-learn, as the case may be. I would recommend to those who can’t take the paid course or who have no background but possess a keen interest to pick up a copy of “Milady’s Standard Textbook of Cosmetology” or a similar beauty school textbook. It discusses everything you did but in greater detail. I still have mine from hair school and I intend to review it. Thanks again!

  276. Kingsley Kesiie

    Listening to this 2nd lesson is really peaking my interest in this cosmetic industry. All I have is high school chemistry but following you is tickling me well well. I plan to get involved in the antiperspirant deodorant industry as an enterpreneur. Hopefully, I will make friends with a formulator at this forum who can be of assistance, even if I cannot do things all by myself. What a great flair for impartation of knowledge!

    1. Perry Romanowski

      Thanks for the kind words!

  277. Courtney

    Great presentation! It was thorough and very easy to understand. I love your presentations and reports. I learn a lot and it’s obvious that you enjoy teaching and you have a knack for it. However, in the beginning you said that the head of a surfactant molecule is “hydrophobic” instead of “hydrophilic”. Keep up the good work and I can’t wait for the third presentation!!! Thanks for putting these together!

  278. Cheryl

    Perry,
    I really enjoyed Lesson 2. Just as lesson 1, your lesson plans are well thought out making the transference of knowledge easy. Your delivery of the message that there is a lot more involved in formulating products than most people realize is not intimidating, but very educational. I am looking forward to Lesson 3. I purchased your book, Beginning Cosmetic Chemistry and have started reading it. I must admit, it is difficult not to jump around and read specific chapters that peak my interest. It really is an awesome book. My formulas are based on natural ingredients and I am looking forward to taking your Natural Formula Course. Of course, I am using preservatives in my formulas. Hope you have a nice weekend.

  279. Linda Crenshaw

    I would like to know how I can get a chemist to help me with my idea’s. Or at least point me in the right direction. I took the lessen but I am not interest in a job just how to and knowledge of which I greatfully received. Can you tell help me please?

    1. Perry

      Hello Linda,

      I would post your request in our cosmetic science forum. There are chemists there who may be able to help you.

      thanks
      Perry, 44

  280. mostafa

    This gorgeous Thank you very much and I hope fruitful cooperation
    Mostafa

  281. M.Nadeen

    My 2nd thanks and appreciation to you for the 2nd lesson. Its a great contribution to the phrase that knowledge does decrease when given, it increases. Now I am very keenly looking forward to Lesson-3 of this course.

  282. Linda Crenshaw

    I learn a lot about. Hair question, the healthy hair you explan is underneath the epidermis and not seen? Why when it comes out of the head it is consider dead cells when it beautiful and look healthy?, organic mixtures question: do all the entire list under the organic is used instead of chemical for product such as hand lotion etc? This is so interesting.

    1. Perry

      Hair looks beautiful in the same way that a silk scarf or a tailored suit looks beautiful. Silk fibers and cotton fibers are not alive, neither are hair fibers.

  283. Anita

    Thank you so much for all the information that you share with the rest of us. J am looking forward to part 3.
    One question, if you have time to answer it;
    I thought that the element building up silicone was Silisium. Is that wrong?
    Again; thank you for all your information

    Anita.

    1. Perry

      I’m not familiar with the material Silisium. It is not part of the cosmetics industry.

      1. Alexandra

        Well, I think Anita misspelled the word here. Silicium is the latin name for Silicon. Accordingly, to say Silicium is building up silicone will be as correct as saying that so does silicon.
        Both of you are right. 🙂

        PS. The course is great for begginers. I’ve learned all of this at University.

  284. trang

    I got a lot of useful information and an overview about cosmetic chemistry. Thank you!

  285. lorena

    Perry:

    thank you very much, it was a great presentation, I really enjoyed it. I am an undergraduate chemistry student and I am interested in nanotechnology and cosmetics. I´ve heard about nanocosmetics and I was wondering whether there was some course, etc. I could take to learn more about it.

    Keep up the good work!!!!

    Best wishes

    1. Perry

      Thanks Lorena. I’m not aware of any course currently that focuses only on nanocosmetics. What did you want to know?

  286. SREENIVASA BALIGA

    THANKS FOR VALUABLE INFORAMTION

  287. Christie

    Thanks! I learned a lot!

  288. Kesho

    Thank you so much. It was very informative and your explanations are easy to follow making learning great.

  289. zayd thabit

    thankyou its very useful.

  290. rose

    I meant that there is no need to put panthenol or oils to hair because they won’t make it healthier or treat it or make shiner , so the usage for all hair products is just to clean the hair !

  291. rose

    when I found this site from the first time I knew that I am in the right place. thanks a lot. but I have a question, if the hair is a dead tissue that is mean that all hair products won’t be useful and there is no need for them especially that you can use a hair mask from a big company to treat hair problems like breakage , dullness, split ends but it didn’t make anything at all. and all stuff that used in shampoo like panthenol, herbal infusions or extracts & oils won’t repair any hair problems. is this true ?

    rose

    1. Perry

      Well, products for hair are useful because even though hair is dead tissue, it still can get dirty and your body creates oil that gets absorbed onto the hair. But when companies say things are put in hair to help the “health” they are exaggerating. Think of hair like your shoelaces or clothes. You wash them but you can’t make them more healthy.

  292. Fatima

    Excellent chapter two thank you Perry!!

  293. Sari

    Nice and simple way of presentation
    Thank you Perry.

  294. SKaranisas

    i enjoy it!it was very helpful!!!thank you!!!!

  295. Josué

    THANKS! GREAT WORK

  296. Kelly

    Thank you. Very informative. As an Aesthetician, it is always helpful to have a deeper understanding of the chemicals that I am using and their applied benefits.

  297. Brenda

    Very informative and clear. Thank you.

  298. Juliana

    Very helpful. Thank you!

  299. Nataly

    It’s a very general introduction but I must admit I did learn some new things and it refreshed my memory on things I did know.
    Looking forward for a next lesson.
    Thanks a lot.

  300. Bedour M

    Thank you so much, that was a simple and clear lesson and very informative too

  301. jeon jung gean

    Thanks a lot for great Valuable information.
    I am very excited to see next Lesson.

  302. Nisha

    Thank you for very informative videos.

  303. Manoranjan

    Hi Perry,

    It’s very much informative and hope to learn more. Thank you very much for your great lessons. I really appreciate your efforts.
    Good luck.

  304. Wanda

    What an informative lesson! I am so glad you are doing this because it is nearly impossible to find information like this that actually relates to cosmetics rather than just chemistry or biology in general. Looking forward to the next lesson.

  305. Pamela

    Thank you for the great course! I recently signed up, and am amazed by the value in the course content. Thank you so much for providing this stellar service.

    Pamela

  306. Carlos

    A very big help for me, thanks Perry!!!

  307. Pilar

    It’s really helpful for us, the beginers. Thanks, Perry, I’m waiting for thr next lesson.

  308. George

    Nice and simple chemistry related to cosmetics. Well put forward in lesson 2.

  309. Raziq Dad

    thanks, it is really very nice and helpful.

  310. Jean

    This is so very helpful to me. I can barely wait for the next course!

  311. Vivian Couto

    I’m really anxious to see the next lesson. Good work Perry, thank’s a lot.

  312. Jip

    Thank you for making this video.

  313. marcelo freitas

    It’s very useful! Thank you, Perry!

  314. aram

    thank you very much perry, it was a brief and useful review of your book. I wish, I could be there in US to benefit from your complete training program.

    1. aram

      i should reply myself…!!!! i just saw that the program is online, so the only thing i need is a credit card 🙂

  315. Roza

    thank u! was really interesting 🙂 specially the chemical names called by it’s trade name. Do u know where i can find at least some important or common cosmetic chamicals trade names and structure? thank u again!

  316. Ayana

    Thank you sooo much! But I just noticed something. In the first part (surfactants), you said hydrophobic instead of hydrophilic. Hihi. But seriously, thank you for this! Learning a lot! Can’t wait for the next parts 🙂

    1. Diana Lee

      True! lol but it was super helpful so it’s okay, people make mistakes :p

  317. Isabel

    It’s very useful!

  318. Emma

    I think this lesson is more about biology. Overall, great video for knowing the applications of different ingredients used in the cosmetics.

  319. Paul Anthony

    I learn several things in each lesson. It’s a great service that your doing, helping a lot of up & coming cosmetic chemist. Thanks Perry your greatly appreciated.

  320. Corey

    Hi Perry,
    I would like to introduce myself, my name is Corey, I have a B.S. in Chemistry, and several years experience in both the consumer product and chemical industries. I have recently taken a regulatory affairs position for a designer/distributer of children’s and teen cosmetics. I have found your website to be very helpful while learning to navigate the world of cosmetic chemistry, and would like to say thank you for the great resource you are providing. Cheers!

    ~Corey

    1. Pamela

      Congratulations Corey! Keep us posted too, on your end of the cosmetic world.

  321. Pat

    Hi Perry,

    This mini series was done very well. I am glad that Ifound out about Chemist Corner. I look forward to receiving more and enrolling in your course.
    Thanks Pat

  322. Cassidee

    it’s great that you’re doing this because it makes me way less hesitant to enroll in the course itself. If this is just the mini course with good info, good pictures, good lectures, I’m sure the full course is the same and more. thanks!

  323. La Tronda Lumpkins

    Awesome video. Thanks for the overview. I now have a clearer idea of the key agents in cosmetic formulations.

  324. Christine

    As a newby with no chemistry background, this has been an excellent presentation and acts as a short cut of knowledge. I am working on an organic, natural range of hair and body care products. I am self taught, but on the verge of taking some short private classes. I am aware of some of the contents in this video, however, you have brought them together very nicely giving a clearer understanding. You are a fantastic tutor, and I look forward to lesson 3.

    1. Perry

      Thanks for the kind words Christine. I’m glad you liked the lesson.

  325. Briana

    Again, FANTASTIC info!

  326. Wuttipong

    I like it and get idear for R&D new cosmetic production.
    Thank a lot.

  327. Rouge_Rogue

    Nice overview. Thanks.

  328. Zenith Czora

    Nice presentation, some questions on surfactants and preservatives:
    1. Does the cosmetic industry uses the ethoxylated type of surfactant?
    2. On preservative, is there any preservative that are not formaldehyde base or formaldehyde donors?

    1. Perry

      Hello Zenith – Thanks for the kind words.

      1. Yes, the cosmetic industry uses ethoxylated surfactants (e.g. Sodium Laureth Sulfate)
      2. Yes, there are parabens, organics, salts, alcohols, etc. See this post about preservatives.

  329. jones appiah

    nice presentation but i want to buy the book and i am in Ghana. how do we begin the process

  330. Maya Devi

    Hello Perry! Wonderful video, again! I’m learning about cosmetics as I work in chemical trading that wants to expand our business to cosmetic ingredient. My background myself is actually a food technologist.

    Your video makes it simple and understandable.

    I have a question: surfactant, fatty acids, polymers, and silicones can act as a conditioning agent. How do a cosmetic chemists determine which one to use or which combination to use in their formula?

  331. Laura

    Nice video. A good overview of the main ingredients in cosmetics. I wasn’t able to find a better explaination of these topics anywhere else online. Thanks so much.

  332. megha jain

    itz a great video….lot of things i dint knw earlier…..thnx for telling such gr8 thngs…

  333. Kevin Katechis

    Perry, very good video. However, there are some actives and transdermal penetration enhancers called TPCs (such as liposomes) that do penetrate the epidermis which are in OTC products today. As you know, if you make the claim that it penetrates the skin then the FDA considers it to be a drug and such claims are forbidden. I think it is important for chemists leaning towards the cosmeceutical track to understand this difference. I understand that this may be a little deeper than the scope you are targeting for your courses but should be mentioned don’t you think?

    1. Perry

      Good addition Kevin. I think the key is that cosmetics are not supposed to interact with the skin (or body) in the same way that OTC are allowed.

  334. Mai Hoang

    OMG, when I was watching your video, I felt like I just found a big bag of gold on the street :), and I just wanna kiss you <3. Thank you so much for your effort and your time. You have no idea how much your information help us (or at least me). I'm looking forward to 3rd video, and will enroll in your course any time soon. You're the best.

  335. Perry

    Thanks for the kind words everyone!

  336. Susan

    With a decades old microbiology degree and an esthetician license, I am developing a very small line of skin care products. The information in these lessons is like hiring a good consultant. THANK YOU. I will sign up for your course when my finances allow. Please don’t give up on us…..you have a solid following out here.

  337. mohammed hafez

    Valuable information and very, very great
    I am very excited to see Lesson No. 3
    I wish you progress and lasting success

  338. Eliza

    You are my new inspiration, Perry 🙂 Thank you so much for sharing your knowledge so generously, I’m saving up for the course. I had a good laugh when I walked out for a cup of tea while leaving the video on and you started about ‘fatty acids’, cos when you’re not paying attention it sounds like something else entirely LOL

  339. Nancy Liedel

    Good coverage and interesting, while encouraging sales of the course. Nice job.

  340. Geng Li

    Great Work, appreciate for your effort

  341. Tolu Ade

    Awesome information! I really appreciate this mini course as it gives me an edge and overview!

  342. Thembi Mtombeni

    Thanks Perry, you really take your time to fill in the gaps of college education. Thank you, Don’t you think they should revamp curricula to make it more useful in the real world of a cosmetic chemist?

    1. Perry

      Well, that would be nice but universities are more focused on training future chemical researchers and less on training future applications chemists. I think a course in ‘Applied Chemistry’ should be part of the curriculum.

  343. Jessie Desrouleaux

    Great job. We can all benefit from it. I wish I could afford your course. I ‘d be intersted in the color cosmetics section. Most of the other sections, I’m already practicing on the job. I wish there were more like you when I was starting out.
    Thanks!

  344. Nadira

    Thank you so much for such a great overview. I really appreciate what you’re doing!!! Please Keep up the excellwent work.

  345. Perry

    Some noteworthy edits…

    There is a point in the video I say “hydrophobic” head. I meant to say “hydrophilic” head.

    At some point in the video I mix up the term silicon (the element) with silicone. It’s a pretty common error in the cosmetic industry to use them interchangeably. Most of the silicon-containing raw materials are silicone elastomers which are a class of polymers used as esthetic additives in skin and hair care products.

  346. Gary Neudahl

    Good overview, with relevant basics for the new cosmetic chemist.

  347. Rebekka

    Hi Perry, Thanks so much! I did have organic chemistry in College (making perms and such LOL), but still am far from being a cosmetic scientist. Your help is very much appreciated! I am just starting out with soaps and such, but one day I will own a SPA! Thanks again for helping me along with the first steps, long way to go!

  348. Chrysa

    @Perry..
    Thanks for the answer.

  349. Oxana

    I admire all your videos!!!

  350. andrianto

    Yes, Perry. I do appreciate this lesson esp. for someone back to workforce from long hiatus..like me. Still waiting for the next lesson, and of course I’ll file this for my docs. I agree that the knowledge within this topics so huge and vast as science always develop and always being update like this lesson do is the answer.

  351. Marilyn Chan

    I really do appreciate your effort in sharing your time and knowledge of the industry. Nice lessons for start-up cosmetic chemists like myself. Keep up the good work.

  352. Perry

    @Chrysa – not a silly question at all. There is the potential for penetration at the hair follicle however it just hasn’t been demonstrated to happen to any appreciable amount.

  353. Chrysa

    I wonder-maybe a silly question-if a product applied on the skin, and on the skin there are hair of course, can that penetrate through the skin via the hairs’ pore?

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