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Topical OTC use. Benzoyl peroxide is used at 2.5-10% in gels, creams, and washes, applied to acne-prone areas once or twice daily; lower strengths (2.5-5%) are usually as effective as 10% with less irritation. There is no oral or systemic dose — it is not ingested. It is often combined with a retinoid (e.g. adapalene) for greater effect. This library does not provide an ingestion protocol.

Any time

Leave-on gel/cream (2.5-5%) or a fixed combination with a retinoid

Topical cosmetic. Cysteamine 5% cream is typically applied once daily to areas of melasma as a short-contact treatment (left on for ~15 minutes, then washed off) to limit odor and irritation, with daily sunscreen. There is no oral or systemic use in this context. This library does not provide an ingestion protocol.

Any time

Cysteamine 5% cream (short-contact application)

• For topical (skin) use only — not for ingestion, not for injection
• Known allergy/sensitivity to benzoyl peroxide (true allergic contact dermatitis is uncommon but possible)
• Application to broken, severely inflamed, or sunburned skin until healed

• Topical retinoids degraded by oxidation (some tretinoin formulations)
• Other irritating actives (acids, other retinoids)

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

• Other irritating actives (acids, retinoids)