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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)

Topical use, typically ~2-5% tranexamic acid in a serum applied to areas of melasma once or twice daily, alongside daily sunscreen. There is no oral or systemic dose in this cosmetic context — the ingested medication is a separate prescription use with clotting-risk considerations. This library does not provide an ingestion protocol.

Any time

Leave-on topical serum (≈2-5% tranexamic acid)

• 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)

• Topical use here is for skin only — do not self-medicate with oral tranexamic acid for melasma without a clinician (clotting-risk considerations)
• Known allergy or sensitivity to tranexamic acid or formulation excipients
• Application to broken, irritated, or compromised skin until healed

• Other leave-on brighteners/actives