Retinoic Acid / Prescription Vitamin A / Retin-A
The active form of Vitamin A — the most potent and clinically studied retinoid. Binds directly to RAR receptors at full strength. FDA-approved for acne and photodamage. The initial retinoid reaction is more intense than retinol but subsides in 4–12 weeks. Prescription only in most countries.
This concentration sits at or below the 1% line — that's expected and effective for this ingredient. Below the 1% line isn't automatically fairy-dusting; some ingredients genuinely work at low doses.
Prescription only. PM, pea-sized amount for entire face. Begin at 0.025% and titrate under dermatologist guidance. Strict daily SPF mandatory. Contraindicated in pregnancy.
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