Let’s #ClntheSlate: Lactic v. Glycolic Acid
Lactic and glycolic acids produce similar results in your skincare routine, though there are key differences, stemming from their molecular structure. Glycolic acid, which is derived from sugarcane, is smaller and penetrates deeper into the skin. This being the case, Glycolic may be the less tolerable acid for sensitive skin. The deep penetration also means Glycolic acid is best used at night, and followed by moisturizer, as it can be drying.
Lactic acid – often sourced from milk or sugar-rich foods – is a bit larger, and therefore stays more superficial. This makes lactic acid the more universally tolerated of the two AHAs. Uniquely, lactic acid makes up part of your skin’s Natural Moisturizing Factor (NMF), which maintains balanced hydration and optimal barrier function.
Both lactic and glycolic acids:
- Promote cell turnover, in turn evening skin tone, lightening hyperpigmentation, combating sun damage, and clearing pores
- Help clear acne by clearing dead skin and excess sebum
- Act as humectants, pulling moisture from the air to the skin
- Combat signs of aging and boost collagen by stimulating fibroblasts – type of cell that contributes to the production of connective tissue – to secrete collagen fibers
These AHAs are potent on their own, and can be even more effective when combined in a single formulation. Major warning here: only use lactic and glycolic acid together if they are paired in a single product formulation – never try pairing separate lactic acid and glycolic acid products on your own. Out of balance, the combination could wreak havoc on your skin barrier.
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