What Lactic Acid does
Its larger molecule penetrates more slowly than glycolic acid, giving a milder exfoliation with less sting.
Lactate is also part of the skin's natural moisturising factor, so it hydrates as it exfoliates — unusual for an acid.
Worth using if…
- Dry or sensitive skin that can't tolerate glycolic
- Dullness and flakiness
- First-time acid users
Safety & watch-outs
- Still increases sun sensitivity — wear sunscreen.
- Higher strengths (10%+) are not beginner territory.
Lactic Acid in pregnancy: Ask your doctor
Generally viewed as lower concern than retinoids, but confirm with your clinician.
Fungal acne (): does not feed it
AHA — not a fatty acid. The fungal-acne yeast feeds on fatty acids roughly C11–C24 and the esters built from them, so what matters in a finished formula is the whole list, not one ingredient.
Check a whole formula for malassezia triggers →Comedogenic rating: 0/5 · non-comedogenic
Non-comedogenic. Ratings come from the published Fulton scale, which was measured on rabbit ears rather than human faces — treat it as a rough signal, not a verdict on a finished formula.
Check a whole formula for pore cloggers →Common questions
Can I use lactic acid every night?
Some people can, but 2–3 nights a week gives most of the benefit with far less risk of over-exfoliation.
Informational only, not medical advice. Written from public regulatory and dermatology references (EU Cosmetics Regulation annexes, SCCS opinions, CIR reviews, published Fulton-scale data). Concentration, formula and your own skin all change the outcome — consult a clinician for personal concerns.
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