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Vitamin C is one of the most versatile and transformative products you can have in your beauty arsenal. This powerful antioxidant can decrease the appearance of dark spots, brighten and even skin tone ...

How to use an at-home vitamin deficiency test For any further questions, all reputable at-home tests will have instructions and a customer care line. Most vitamin deficiency tests require a blood ...

So, what gives? Does it depend on the percentage of vitamin C included in the serum? And — why apples? According to Ron Robinson, cosmetic chemist and founder of BeautyStat, apples are particularly ...

While vitamin C is essential for health, high doses can cause serious side effects. Learn the risks and how to use it safely, based on research.