The big 4 anti-aging topicals: vitamin C serum, retinol, growth … How to Use Retinol and Vitamin C Together - Fleur & Bee Using Retinol & Vitamin C Together for Your Skin - Neutrogena Skincare Ingredients You Should Never Mix Use L-Ascorbic Acid and retinol together and the risk of irritation increases. Can Retinol is sweet and works best at a pH of 5.5-6, vitamin C is sour and works its best at a pH of <3.5.
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