Lactic Acid

What it is

Lactic acid is an alpha hydroxy acid (AHA) naturally found in skin as part of its moisturizing factor. Applied topically, it loosens the bonds between dead surface cells to promote gentle exfoliation while also acting as a humectant that draws water into the stratum corneum.

Benefits

Smooths texture, reduces roughness and the look of fine lines, and improves hydration; clinical improvement in photodamage and skin firmness is reported at roughly 5-12% in leave-on formulations, with higher concentrations producing greater dermal effects.

When to take it

Apply at night and follow with broad-spectrum SPF every morning, since AHAs increase UV sensitivity. Start a few nights per week and build frequency as tolerance develops.

Side effects

Can cause stinging, tingling, redness, and dryness, especially at higher concentrations or low pH. AHAs increase sun sensitivity, raising the risk of UV-related damage if SPF is skipped.

Sources

• Comparative effectiveness of alpha-hydroxy acids on skin properties
• Effects of Cosmetic Formulations Containing Hydroxyacids on Sun-Exposed Skin (PMC)

Products containing Lactic Acid

No products in our database contain this ingredient yet.