Lactic Acid
乳酸
Also known as: AHA
What it does
- Gentle chemical exfoliation
- Hydrating while exfoliating
- Brightening
Effective concentration
Minimum 5% Optimal 10% Maximum Beneficial 30% (professional)
Gentler than glycolic. Good entry-level AHA.
Evidence
Strong evidenceWell-established AHA with humectant properties.
Skin types
Well suited for: Dry Sensitive Normal
Use with caution: Very Sensitive
Gentlest AHA, good for dry/sensitive skin.
Helps with
Dullness Uneven Texture Dark Spots & Hyperpigmentation Dryness
Interactions
Use with care Retinol
Using together increases irritation risk. Alternate nights.
Irritation potential
Low To Medium
Comedogenic rating
0 / 5
Pregnancy
Generally considered safe during pregnancy
Low concentrations (under 10%) generally considered safe.
Good to know
Best AHA for sensitive/dry skin due to humectant properties. Always use SPF.
References
Compound data from PubChem (U.S. National Library of Medicine).
Further reading
- Poly-l-Lactic Acid as a Regenerative Treatment for the Glucagon-like Peptide-1 Receptor Agonist User Population — Dermatol Surg (2026)
- Mechanisms of Cytokine Modulation and Inflammatory Cascade in Bio-stimulatory Skin Rejuvenation: A Comprehensive Literature Review of Poly-L-Lactic Acid, Calcium Hydroxyapatite, Polycaprolactone, and Poly-D, L-Lactic Acid — Cureus (2026)
Selected peer-reviewed reviews on this ingredient, indexed by Europe PMC. Provided as background, not proof of any specific claim.
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Analyze a productEducational information only — not medical advice. Always patch test and consult a dermatologist for skin concerns.