Lactic acid is naturally present in milk and is a popular alpha hydroxy acid (AHA). It has a larger structure than glycolic acid, also an AHA which are beneficial in the treatment of dermatological conditions, encouraging exfoliation and cell turnover on the surface of the skin while stimulating the skin to reduce signs of ageing. Lactic acid is a more gentle AHA and is more moisturising and less likely to cause irritation than normal AHAs. This makes it a better choice when it comes to sensitive skins, although higher concentrations of lactic acid may still cause irritation so always do a product patch test beforehand. It gives the skin a smoother complexion.
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