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Topical cosmetic only. Leave-on glycolic acid is used at roughly 5-15% in lotions/serums (often at low pH), applied to clean skin a few nights per week and building as tolerated; professional peels (20-70%) are applied in-office at intervals. There is no oral, injectable, or systemic dose — it is not ingested. Pair with daily sunscreen. This library does not provide an ingestion protocol.

Evening

Leave-on lotion or serum (≈5-15% glycolic acid)

Topical cosmetic only. Kojic acid is typically used at roughly 1-2% in leave-on serums or creams (or as the more stable kojic acid dipalmitate), applied to areas of hyperpigmentation once or twice daily, often alongside other brighteners and daily sunscreen. There is no oral, injectable, or systemic dose — it is not ingested. This library does not provide an ingestion protocol.

Any time

Leave-on topical serum or cream (≈1-2% kojic acid, or kojic acid dipalmitate)

• 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

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

• For topical (skin) use only — not for ingestion, not for injection
• Known allergy or sensitivity to kojic acid
• Application to broken, irritated, or compromised skin until healed

• Other leave-on actives (acids, retinoids, hydroquinone)