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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 only. HA serums are applied to clean, slightly damp skin once or twice daily and sealed with a moisturizer to hold water in (in very dry air, HA applied to dry skin can draw moisture outward). There is no oral, injectable, or systemic dose in this cosmetic context. This library does not provide an ingestion protocol.

Any time

Leave-on serum with high- and low-molecular-weight HA, sealed with a moisturizer

• 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 in this context — not the injectable filler
• Known allergy or sensitivity to the formulation
• Application to broken or compromised skin until healed

• Other leave-on actives