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Discover the best vitamins for dark spots. Learn the science behind these skin-brightening ingredients and how to add them to your skincare routine.
![Absorbic acid benefits](http://protocol-lab.com/cdn/shop/articles/Ascorbic_Acid_for_Skin_{width}x.jpg?v=1705977848)
Ascorbic acid is the purest form of vitamin C in skincare. Learn everything you need to know about ascorbic acid for skin, and why it’s the ingredient to look for in a vitamin C serum.
![Best value Vitamin C serum](http://protocol-lab.com/cdn/shop/articles/042221_Protocol_SS2120585_{width}x.jpg?v=1682536059)
Many brands don’t use real vitamin C, instead choosing ineffective derivatives. To make sure you have a vitamin C serum that works, here are our key buying tips.
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You've heard the promises of vitamin C serums, but do you really know what vitamin C can do for your skin? We're here to explain (and back it up with science).