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Home Cosmetic Science Talk Formulating Safety of Lactic acid above ph 7

  • Safety of Lactic acid above ph 7

    Posted by Anonymous on March 4, 2020 at 1:14 pm
    If I understand correctly lactic acid is dangerous solely because of its low pH, or not?
    If I were to make a 10% lactic acid aqueous solution with a pH 7 would it be harmful to the skin as a leave on product at such high concentration?
    I know that above pH 5 lactic acid has no benefit to the skin however I am interested if a higher pH eliminates its side effects regardless of the concentration used.
    Thanks for the help.
    Pharma replied 3 years, 2 months ago 2 Members · 3 Replies
  • 3 Replies
  • OldPerry

    Professional Chemist / Formulator
    March 4, 2020 at 1:44 pm

    You can expect it to be mild to moderately irritating to skin even at pH of 7.  See safety report.

    Of course, if you know it’s not doing anything above pH 5, why would you add 10%?

  • Anonymous

    March 5, 2020 at 9:22 am

    Perry thanks for the pdf you provided, it has really been helpful. I decided to use 5% lactic acid.

  • Pharma

    March 5, 2020 at 11:52 am

    @Perry Lactates (= pH adjusted lactic acid, so to speak) are good humectants, similar to PCA, amino acids, polyols etc. ;)