Retinol breaks down to retinoic acid on the skin ... like tretinoin — you don’t need a dermatologist to buy retinols. Yes, retinols are weaker and may take a bit more time to yield the ...

The gold standard retinoid is retinoic acid (tretinoin) and this has good evidence for promoting cell turnover, stimulating collagen production, fighting free radicals, unclogging pores ...