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Lac6.0

Lactic Acid (topical)

Moderate safety

Evidence

Evidence Score6/10

Studies: 7

Meta-analyses: 0

Dosage & timing

Dosage:

Topical cosmetic only. Leave-on lactic acid is used at roughly 5-12% (lower for hydration, higher for exfoliation); professional peels use higher strengths. Apply to clean skin, often at night, building frequency as tolerated, with daily sunscreen. There is no oral or systemic dose — it is not ingested. This library does not provide an ingestion protocol.

Best Time:

Evening

Can take on empty stomach

Form:

Leave-on lotion or serum (≈5-12% lactic acid)

What you'll notice

ℹ️ Cosmetic, appearance-only — not a health effectneutral

Throughout

💧 Hydration and stronger barrierpositive

2-8 weeks

💆 Smoother, less photodamaged skinpositive

8-22 weeks

Safety

Moderate safety

Contraindications:

For topical (skin) use only — not for ingestion, not for injection
Known allergy or sensitivity to AHAs
Active eczema/dermatitis or broken/sunburned skin until healed

Drug Interactions:

Other leave-on actives (retinoids, other acids, benzoyl peroxide)

Side Effects:

Stinging, burning, or peelingIncreased sun sensitivity

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