@shark.pins: #waifuverse Tretinoin is all-trans retinoic acid, a vitamin A derivative approved for acne and sun-damaged skin for around 40 years. It works through retinoic acid receptors to speed skin cell turnover and shift collagen production. Randomized-trial evidence supports it for acne and for fine and coarse wrinkles, though irritation in the early weeks is common and higher strengths irritate more. Topical absorption is low, but guidelines still advise avoiding it in pregnancy. Here is what the research actually says. Sources: PMC12615114 PMC12653878 PMC9804728 PMID:30674002 PMID:23839179 PMID:26215715 For EDUCATION ONLY. Not medical advice. Not encouragement to use. #tretinoin #retinoid #skincare #acne