Some studies have found that creams with vitamin C can raise collagen production, protect against damage from UVA and UVB rays, help reduce dark spots and uneven skin tone, and reduce redness. You have to use a skin product with the right type of vitamin C, though. L-ascorbic acid may be the best for wrinkle relief. You may also see a vitamin C ingredient listed as ascorbyl palmitate.
(source: WebMD)