Vitamin C serves many purposes for the skin, especially in a facial mask.  It helps with discoloration & the production of collagen in the skin.  Collagen(secret of youth) is what makes are skin look young and keeps our skin from forming wrinkles. Vitamin C also helps fade the appearance of age and sun spots. Vitamin C is also a powerful antioxidant which attacks free radicals (the enemy) in the skin that are causing us to age prematurely. I like to think of a Vitamin C mask as a probiotic for the skin during facial treatments, especially with skin dealing with hyper-pigmentation, dark spots, and wrinkles & giving you a beautiful and even tone.