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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 OTC. Apply a broad-spectrum SPF 30+ sunscreen daily to sun-exposed skin as the last step of a morning routine, using an adequate amount (about 2 mg/cm² — roughly a nickel-sized dollop for the face, a shot-glass for the body) and reapply every ~2 hours of sun exposure and after swimming/sweating. Mineral (zinc oxide / titanium dioxide) filters are preferred if you're concerned about systemic absorption. There is no oral or systemic dose — it is not ingested. This library does not provide an ingestion protocol.

Morning

Broad-spectrum SPF 30+, applied daily; mineral (zinc oxide/titanium dioxide) if concerned about absorption

• 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
• Known allergy/sensitivity to a specific UV filter (switch to a mineral filter)

• Other leave-on actives