The Skin Treats Vitamin C Five-Day Skincare System is a week long treatment for skin that contains two Hydrogel Face Masks, to be used on the first and last day of the treatment, and 5 ampoules of Vitamin C serums. The Vitamin C serum is intensely hydrating, brightening, helps to reduce redness and even out skin tone, impedes hyperpigmentation, reduces circles under the eyes and helps to promote collagen production.