Retinol, retinal, tretinoin, bakuchiol — the highest-evidence anti-ageing aisle is also the most confusing. Five questions match your skin, goals, and tolerance to an honest starting point. About 60 seconds. No products, no sales pitch.
Neutral, evidence-graded reference. Not medical advice, diagnosis, or treatment. Tretinoin is a prescription medicine — a matter for a dermatologist.
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