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15g

Any time · with food (preferred)

Hydrolyzed collagen peptides (powder)

Topical cosmetic only. OTC retinol is formulated roughly 0.1-1% in leave-on serums or creams and applied to clean, dry facial skin at night, starting 2-3 nights per week and building to nightly as tolerated. There is no oral, injectable, or systemic dose — this is not ingested. Higher concentrations work somewhat better but irritate more; pair with a moisturizer and a morning sunscreen. This library does not provide an ingestion protocol.

Evening

Leave-on topical serum or cream (0.1-1% retinol)

• Allergy to source (fish, shellfish, eggs, beef)
• Phenylketonuria (some products contain phenylalanine)

• No significant interactions known

• For topical (skin) use only — not for ingestion, not for injection
• Pregnancy and breastfeeding — generally advised to avoid topical retinoids as a precaution
• Active eczema, rosacea flares, or broken/irritated/sunburned skin until healed

• Strong leave-on exfoliating actives (AHAs/BHAs, benzoyl peroxide)
• Other retinoids (prescription tretinoin, tazarotene, adapalene)