15 Amazon Vitamin C Serums That'll Brighten Your Skin in No Time

Sunday Riley C.E.O. 15% Vitamin C Brightening Serum ($85)

All you need is one to two pumps of this serum for a radiant complexion that improves dullness and discoloration. It uses a potent 15 percent of THD vitamin C. It also has glycolic acid to gently exfoliate the skin. If you lean more sensitive or want to be extra cautious in the summertime, use this at night rather than during the day. "My skin is very fair with a yellow undertone and I (had) red acne scars. This helped fade them tremendously and my skin is more even toned. I love that the concentration of vitamin c is not so large as some other products but is still high content enough to get results. So you get all the benefit of vitamin c but it's more gentle," one reviewer writes.