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Topical cosmetic only. Leave-on mandelic acid is used at roughly 5-10% in serums; professional peels use higher strengths (often a salicylic-mandelic combination). Apply to clean skin, 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.

Evening

Leave-on serum (≈5-10% mandelic acid) or a professional (salicylic-)mandelic peel

Topical cosmetic only. Acne trials used a 5% tea tree oil gel applied to affected areas (typically twice daily). Avoid undiluted (100%) application, which is more irritating and sensitizing. Patch-test first, and use fresh, properly stored product (oxidized oil raises allergy risk). There is no oral or systemic dose — it is not ingested (and tea tree oil is toxic if swallowed). This library does not provide an ingestion protocol.

Any time

5% tea tree oil gel (the trial-tested strength)

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

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

• For topical (skin) use only — NEVER ingest (tea tree oil is toxic if swallowed)
• Known allergy/sensitivity to tea tree oil or other essential oils
• Undiluted application to skin (higher irritation/sensitization risk)

• Other topical actives (benzoyl peroxide, retinoids, acids)