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Topical only. OTC cosmetic azelaic acid is typically around 10%; prescription strengths are 15% gel/foam (rosacea) and 20% cream (acne), applied as a thin layer to clean skin once or twice daily. There is no oral, injectable, or systemic dose. For rosacea or persistent acne, the prescription form under a clinician is the evidence-based route. This library does not provide an ingestion protocol.

Any time

Leave-on topical gel, foam, or cream (OTC ~10%, or prescription 15-20%)

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 azelaic acid or formulation excipients
• Application to broken, severely irritated, or compromised skin until healed

• Other strong leave-on actives (retinoids, AHAs/BHAs, 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)