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These combinations are popular in sports and regenerative medicine circles, although they are not FDAapproved for general healing indications and human data are still limited

Prescription tretinoin (the strongest retinoid) has been studied in large-scale randomised controlled trials for decades

Nephrology 2006;11:306312

Retinol increases cell turnover and stimulates collagen from one pathway
Clinical studies need IRB oversight, and preclinical research must follow Animal Care and Use Committee (IACUC) guidelines, in accordance with the Animal Welfare Act (AWA)
