11 Reasons to Add Vitamin C Serum to Your Skin Care Routine Vitamin C serum has many health benefits for your skin, including promoting collagen production and protecting against sun damage. Some people may experience side effects. What’s a vitamin C serum? If you have your head in the skin care game, you’ve likely heard of vitamin C serums. Vitamin C is touted as one of the best ingredients on the market for pro-aging support — and the key to maintaining a smooth, even, and glowy complexion. Although you’re probably getting vitamin C in your diet,...