Retinal / RAL
One enzymatic step closer to retinoic acid than retinol — approximately 11x more potent. Delivers faster anti-aging results with more initial irritation ("retinoid reaction") than retinol but significantly less than prescription tretinoin. Clinical studies confirm equivalence to 0.025% tretinoin in some outcomes.
PM only, 0.05–0.1%, 1–2x per week initially. Expect a retinoid reaction for 2–6 weeks. Results visible at 8–10 weeks.
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