Forum Replies Created

Page 74 of 105
  • MarkBroussard

    Professional Chemist / Formulator
    June 18, 2017 at 2:31 pm in reply to: Can α-bisabolol invoke flushing/vasodilation?

    Yep, you can pretty much rule out a Bisabolol allergy … if that were the case, you would have had a reaction fairly quickly.

    The flushing must be coming from elsewhere … Is there Potassium Sorbate in your formulation?

  • MarkBroussard

    Professional Chemist / Formulator
    June 18, 2017 at 11:19 am in reply to: Looking for a cosmetic chemist freelancer to formulate foundation for my startup biz

    I always tank my car with Vegan gasoline … it’s low-carb, too!

    That’s about the value of the marketing claim “Vegan and Cruelty-Free” in color cosmetics.  Complete nonsense.

  • MarkBroussard

    Professional Chemist / Formulator
    June 18, 2017 at 1:58 am in reply to: Benzaldehyde Usage Rate

    Ooops! … My Bad … should have read more carefully.

  • MarkBroussard

    Professional Chemist / Formulator
    June 17, 2017 at 11:36 pm in reply to: Benzaldehyde Usage Rate

    David,

    I don’t think you’re going to get much of an effect from using Benzyl Alcohol itself directly as a fragrancing ingredient.  Preservation for sure … have you explored using BA as a preservative complimented with an Almond fragrance oil?

  • MarkBroussard

    Professional Chemist / Formulator
    June 17, 2017 at 10:29 pm in reply to: Benzaldehyde Usage Rate

    Generally around 0.8% … I am certain that this is a regulatory maximum or not, but generally that’s the highest recommended amount by preservatives manufacturers.

  • MarkBroussard

    Professional Chemist / Formulator
    June 16, 2017 at 10:37 pm in reply to: Can α-bisabolol invoke flushing/vasodilation?

    @Doreen81:

    You may have allergy to Bisabolol … although it is not that common, anyone can be allergic to anything.  That would be my best guess on your reaction to Bisabolol.

  • MarkBroussard

    Professional Chemist / Formulator
    June 16, 2017 at 1:42 pm in reply to: PH SHAVE CREAM BOWL

    Proraso uses the Lactic Acid to adjust the pH down.  @belassi  just gave you some good advice.

    I think you need to step back and ask yourself this question:  Is the inclusion of this ingredient going to improve my formulation.  If the answer is “No” then don’t include it … it’s unnecessary and just drives up your cost and formulation complexity.

    I understand that you are just learning … but, heed the advice I just gave you and it will make you a much better formulator … clean, direct formulations that do the intended job with no unnecessary ingredients.

  • MarkBroussard

    Professional Chemist / Formulator
    June 16, 2017 at 12:52 pm in reply to: formulating ingredient to milky&hydrating texture

    They’re probably using Glyceryl Stearate SE (Self Emulsifying) which has the same INCI as Glyceryl Stearate.

  • MarkBroussard

    Professional Chemist / Formulator
    June 15, 2017 at 11:59 pm in reply to: PH SHAVE CREAM BOWL

    Sorry, I meant reduce your NaOH and KOH to 3% … leave the stearic acid at 7.5%

  • MarkBroussard

    Professional Chemist / Formulator
    June 15, 2017 at 10:02 pm in reply to: PH SHAVE CREAM BOWL

    Actually, you will get a better sensorial if you use less base than is required to neutralize all of the Stearic Acid … try dropping your base content down to 3.0% or so.

    The first question I have is:  Why use KOH, NaOH and Triethanolamine?  It’s overkill since they all perform the same function.  Your softest cream is going to be with KOH … you can cut out two ingredients.

    Coconut Oil or Coconut Acid … what can you purchase in your home location? If you have an option use a bit of each.

  • MarkBroussard

    Professional Chemist / Formulator
    June 15, 2017 at 3:37 pm in reply to: Formulating for the Vagina

    Double @johnb commentary … No coconut oil.

    @doctorbrenda provided you with a very good synopsis regarding avoiding oils for vaginal products

    Again, Congratulations on your success thus far!

  • MarkBroussard

    Professional Chemist / Formulator
    June 15, 2017 at 1:25 pm in reply to: Formulating for the Vagina

    @johnb:

    The OP inquired about both a lubricant and a stimulating gel.  That’s why the conversations refer to both.

  • MarkBroussard

    Professional Chemist / Formulator
    June 15, 2017 at 10:12 am in reply to: Formulating for the Vagina

    @johnb: An excerpt from the article you cited:

    Physiology of Cooling from materials such as menthol

    The action of menthol and similar coolant compounds on “thermoreceptors” provides the “cool” sensation via cold receptors. In the case of menthol and certain other coolant compounds one can also get a “hot” or stinging “pain” sensation. Menthol can act at high concentrations in much the same way as capsaicin to produce a hot sensation, but in this case, it stimulates the fibers that register both cold temperatures as well as those that respond to warmth. 

  • MarkBroussard

    Professional Chemist / Formulator
    June 15, 2017 at 2:53 am in reply to: Formulating for the Vagina

    Congratulations on your success, @Chemist5000

    I am quite puzzled … why on Earth would you make a 20 Kg batch of a “product” that has only passed one week of stability testing and has not been Preservative Challenge Tested and will most likely fall under an FDA 510K classification as, per your ingredients list, your product is clearly a personal lubricant intended to used within the vagina.  

  • MarkBroussard

    Professional Chemist / Formulator
    June 14, 2017 at 8:00 pm in reply to: What natural preservatives ?

    The type of preservative will depend on the final pH of your formulation.  Some will only be effective up to pH 6.0, others up to pH 8.0 or so.  But, they may be ineffective if you do not use hurdle technology and preservative boosters.

    I am personally always skeptical of “natural” preservatives in the vein of Lucidal Liquid, Grapefruit Seed Extract and such things … they’re generally junk.

    Go with a proven preservative from a reputable preservative manufacturer such as Linatural Ultra-1 or Ultra-2 for Lincoln Fine Ingredients.

  • MarkBroussard

    Professional Chemist / Formulator
    June 14, 2017 at 7:55 pm in reply to: Is an incubator necessary for microbial testing?

    @tanelise:

    You can purchase a small incubator from Schuelke & Mayr for use with their microbial test strips … costs about $300 to $400.

  • MarkBroussard

    Professional Chemist / Formulator
    June 14, 2017 at 6:43 pm in reply to: Formulating for the Vagina

    There are two effects:

    (1)  Using vasodilators which will increase the blood flow.  

    Viagra works by dramatically enhancing blood flow, and as I previously noted, works for both men and women.  The issue with decreased sensitivity in the clitoris could be twofold … reduced blood flow and/or nerve ending with diminished sensitivity.

    An ingredient like Capsaicin increases blood flow and also creates a warming effect or enhanced “sensation”

    Cooling agents like Menthyl Lactate, Menthol and to a lesser extent Peppermint Oil evaporate rapidly “tricking” the nerve endings into feeling an enhanced sensation.

    So, you’re trying to do two things:  (1) Enhance blood flow, and (2) Create an enhanced sensation/sensitivity with a cooling agent. 

  • MarkBroussard

    Professional Chemist / Formulator
    June 13, 2017 at 11:02 pm in reply to: Formulating for the Vagina
  • MarkBroussard

    Professional Chemist / Formulator
    June 13, 2017 at 10:54 pm in reply to: Formulating for the Vagina

    If you’re inclined to put Menthol, Capsaicin or other stimulants or warming agents on your clitoris, i suspect you also like your sex a bit on the rough side … LOL!

  • MarkBroussard

    Professional Chemist / Formulator
    June 13, 2017 at 8:51 pm in reply to: Formulating for the Vagina
  • MarkBroussard

    Professional Chemist / Formulator
    June 12, 2017 at 5:52 pm in reply to: Formulating for the Vagina

    @Chemist5000:

    Even adjusting for the apparent typo of Natrosol at 5.5% (you keep typing 55%) … your formula adds up to 105%.

    So, it would be helpful if you reposted a formula that adds up to 100%

  • MarkBroussard

    Professional Chemist / Formulator
    June 12, 2017 at 12:41 pm in reply to: Reputable sites (or books) for learning green chemistry?

    @KittyL:

    If you following the standards set by ECOCert and Natural Products Association (NPA) in choosing your ingredients, you will essentially be fulfilling your objective of using Natural ingredients (those derived from sustainable plant-based sources) and Green Ingredients (low environment impact) as both of those factors are a consideration in determining whether or not an ingredient meets the criteria for certification by ECOCert or NPA.  Both organizations have a list of ingredients & suppliers of those ingredients that have been certified.

  • MarkBroussard

    Professional Chemist / Formulator
    June 12, 2017 at 1:37 am in reply to: Emulsifiers for Eye Cream Formulation

    I like to pair Olivem 1000 (4%) with RitaMulse (4%) and add Isoamyl Laureate … it give a nice, light emulsion with excellent spread.

  • MarkBroussard

    Professional Chemist / Formulator
    June 12, 2017 at 1:10 am in reply to: Reputable sites (or books) for learning green chemistry?

    @KittyL:

    KittyL, I might suggest that you post a list of ingredients that you want to include in your formulation and I’m sure you’ll get plenty of helpful advice.

  • MarkBroussard

    Professional Chemist / Formulator
    June 11, 2017 at 3:24 pm in reply to: Reputable sites (or books) for learning green chemistry?
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