Home Cosmetic Science Talk Formulating Deodorant Stick

  • Deodorant Stick

    Posted by Diana1234 on April 16, 2023 at 6:56 am

    Hi, need some advise.

    My deodorant consists of below ingredients

    Cetyl Alcohol

    Glyceryl Laurate

    MCT

    Zinc Ricinoleate

    Cocoa butter

    Shea butter

    Arrowroot powder

    Over time there is some crystal formation. What can i add to prevent that from happening and at what %. Thank you so much!

    Microformulation replied 10 months, 3 weeks ago 7 Members · 7 Replies
  • 7 Replies
  • Graillotion

    Member
    April 16, 2023 at 3:07 pm

    As @chemicalmatt would say….add some Polyglyceryl-3 Diisostearate.

    As I would say….lose the butters and find a replacement. They make you sweat anyway…which is a bit counterintuitive.

    Good luck.

    • This reply was modified 1 year, 1 month ago by  Graillotion.
  • RKB

    Member
    April 16, 2023 at 9:51 pm

    Without knowing the % of each ingredient in your formula, I’m going to guess that the amount of butter in it is too much for the ingredients you have to stabilize things (have you tested this for stability at all yet?) and that it’s also cooling unevenly, allowing some of the fatty acids and cocoa and shea butters to come together before the rest of it. I’m going to also guess that the arrowroot itself may also potentially cause some issues due to uneven distribution.

    Suggestion: Add some waxes…a blend of them preferably and make sure to include one with gelling properties. Reduce the total amount of butter in your formula to be 10% or less. And I’d remove the arrowroot. If you have it in there to make things feel less greasy, look into something like isopropyl myristate to help create a better skin feel.

    • Unknown Member

      Member
      April 23, 2023 at 3:29 pm

      Thanks, percentage of myristate isopropyl in recipe?

      • RKB

        Member
        April 28, 2023 at 7:01 pm

        That’s something you have to figure out. I can’t tell you how much can go into your formula because I 1) do not know your formula and 2) cannot see what the end result will be. Your best bet is to read the manufacturer’s information and its recommended usage range and begin experimenting with that to see how it performs in your formula.

    • Ying

      Member
      July 21, 2023 at 2:22 pm

      What is your Deodorant melting point?

  • Zara

    Member
    May 5, 2023 at 3:52 am

    butter and oil are the food for bacteria. There is no purpose for them to be there.

  • Microformulation

    Member
    July 21, 2023 at 3:23 pm

    Remove the Cocoa Butter and Shea Butter or reduce them to label copy levels if they are critical to the marketing story.

    I think I would go back to the design phase and perhaps look at some starting Formulations from reputable suppliers (Koster Keuenen, Strahl&Pitsch, Prospector Formulations, and other numerous online sources).

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