Vitamin C Vitamin C regenerates collagen production, which has the capability to thicken the dermis, diminish fine lines, & is necessary for firm, youthful skin. Besides, vitamin C is also an antioxidant. It shields skin cells from destroying free radicals effected by UV exposure. Vitamin C-based skincare products might lighten darker patches than the rest of the skin, termed hyperpigmentation. Vitamin C administration impedes melanin generation. This can assist fade dark spots & lead to an extra even-toned complexion.