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Description
Retinoic acid (vitamin A) is an essential supplement in cell culture media for differentiation of various epithelial cell lines (van der Valk et al., 2010)

We also compare it with other established anti-ageing and brightening ingredients, and review whether and how to add it to your routine
No specific results timeline was published in the brand materials reviewed for this article, and no independent testing confirming a timeline was found

, Barrionuevo G., and Weber S
