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Safety of Lactic acid above ph 7
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. -
3 Replies
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You can expect it to be mild to moderately irritating to skin even at pH of 7. See safety report. https://www.dropbox.com/s/dcw9n6jz1khdwvj/lactic-acid-safety.pdf?dl=0
Of course, if you know it’s not doing anything above pH 5, why would you add 10%?
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Perry thanks for the pdf you provided, it has really been helpful. I decided to use 5% lactic acid.
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@Perry Lactates (= pH adjusted lactic acid, so to speak) are good humectants, similar to PCA, amino acids, polyols etc.
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