What is vitamin C serum? Vitamin C serum is a skincare product containing a concentrated form of vitamin C, a powerful antioxidant that helps to brighten the skin, reduce signs of aging, and protect against environmental damage. What are the benefits of using vitamin C serum? Vitamin C serum can help to brighten the skin, reduce the appearance of dark spots and hyperpigmentation,... https://www.phyto-c.com/collections/serums