Sodium Lactate / Lactic Acid ratio

Hi folks.

I have a facial exfoliating peel product made of hydrosols, 10% Lactic Acid, xanthan gum, and preservative. Very simple, right. I read that Sodium Lactate can reduce irritation while boosting the exfoliation effect, in addition to its superior moisturizing. Can any recommend a safe ratio of Lactic Acid to Sodium Lactate?

Thanks in advance!!



  • MarkBroussardMarkBroussard Member, Professional Chemist

    You don't have to worry about "safe" ratio of Lactic Acid to Sodium Lactate.  Adding Sodium Lactate to your peel product will impart all of the benefits you have indicated, but the major effect from a formulation perspective will be that Sodium Lactate will raise the pH.

    If this is a consumer peel products, in the US, the pH should be 3.5 or higher.  So, the answer to your question is that you should add as much Sodium Lactate (the sodium salt of Lactic Acid) in sufficient quantity to raise your pH to 3.5.
    Chemist/Microbiologist formulating in the Organic & Naturals arena under ECOCert/Natural Products Assn/Whole Foods/National Organic Program guidelines focused skincare & haircare products. 

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