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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

Prescription topical: a pea-sized amount of 0.025%-0.1% cream or gel applied to clean, dry skin once nightly. Start low-strength and every-other-night to build tolerance. A prescription drug used under clinician direction — not a supplement regimen.

Before bed

Topical cream or gel, 0.025%-0.1% (prescription)

• 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

• Pregnancy and planning pregnancy (topical retinoid — avoid)
• Breastfeeding (avoid application near areas of infant contact)
• Eczema / rosacea-prone or broken/sunburned skin (irritation)

• Benzoyl peroxide
• Other topical exfoliants (AHAs / BHAs, abrasives)
• Photosensitizing drugs