If your main goal is collagen support and brighter-looking skin, vitamin C may be the better choice. On the other hand, ...

Vitamin C is an essential nutrient that has many functions in your body. Unlike most animals, humans can’t make vitamin C. You need to get vitamin C in your diet through foods like citrus fruits, bell ...

Women's Health may earn commission from the links on this page, but we only feature products we believe in. Why Trust Us? To get the scoop on niacinamide and vitamin C, including what each of them ...