Skin-brightening antioxidant serum Vitamin C is a potent antioxidant that helps defend against free radicals. When used consistently, a face serum with vitamin C can play a powerful role in your anti-aging skincare regimen by delivering skin-brightening benefits and improving the appearance of fine lines, dark spots, and uneven skin tone. CeraVe Skin Renewing Vitamin C Serum is formulated with 10% pure vitamin C (L-ascorbic acid) to help visibly brighten your complexion and support soft, radiant, and healthy-looking skin.