Tretinoin
Definition
Tretinoin (all-trans retinoic acid) is the most potent and well-researched prescription retinoid, available under brand names like Retin-A, Renova, and various generics. Unlike over-the-counter retinol, tretinoin is already in its active form (retinoic acid) and does not need to be converted by the skin, making it significantly more potent and faster-acting. Tretinoin works by binding directly to retinoic acid receptors in skin cells, dramatically increasing cell turnover, boosting collagen synthesis, reducing melanin production, and normalizing the shedding of pore-lining cells. It is FDA-approved for treating acne and has extensive research supporting its anti-aging benefits, including reducing fine lines, wrinkles, rough skin texture, and sun damage. Common concentrations range from 0.025% to 0.1%. The initial adjustment period (often called 'retinization') typically involves peeling, dryness, redness, and purging for 4-12 weeks. Tretinoin significantly increases sun sensitivity, making daily sunscreen non-negotiable.
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