Home Cosmetic Science Talk Formulating Do I need to adjust Hyaluronic Acid % with Addition of Glycerin

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  • Do I need to adjust Hyaluronic Acid % with Addition of Glycerin

    Posted by MJL on May 3, 2019 at 8:13 am

    I’m adding some Centella Asiatica (Gotu Kola) Extract to a serum recipe and the extract is dissolved in water and glycerin. When using the extract at 5% in my formula, there will be 1.975% (to be exact) glycerin in the solution.

    Right now I use 0.4% High Molecular Weight Hyaluronic Acid in my serum recipe and the serum comes out as quite runny, but still has enough “hold” that it can rest on my fingers long enough to get it onto my face without dripping everywhere.

    Will the 1.975% glycerin cause any substantial increase in the thickness of my serum? Is 1.975% high enough of a percentage to warrant dropping the HA down to 0.3%?

    Thanks for your time.

    ngarayeva001 replied 4 years, 4 months ago 3 Members · 3 Replies
  • 3 Replies
  • ngarayeva001

    Member
    May 3, 2019 at 8:16 am

    Glycerin doesn’t increase viscosity. So if HA is used as a rheology modifier in your formula, introduction of glycerin won’t justify reduction of HA.

  • oldperry

    Member
    May 3, 2019 at 1:32 pm

    The only thing the glycerin will do is compete with the HA for available water. I doubt you’ll see any difference.

  • MJL

    Member
    May 3, 2019 at 4:12 pm

    Thanks so much @ngarayeva001 and  @Perry for the information! 

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