Retinoic acid (tretinoin) — (See Active Ingredients, see Vitamin A) A vitamin A derivative that is prescription strength. At the end of the day, it’s only RA (retinoic acid) that modulates gene expression and influences cellular processes in both the epidermis and the dermis, and the path to get ...
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Bev's Skincare Glossary
Want to know more about the details in the chemistry of skin care?
Here you can look up any topic - sorted alphabetically - and read more about what each ingredient includes and does for your skin.