If dark spots or hyperpigmentation are troubling you, then you might want to try out the Murad Vita-C Glycolic Brightening Serum (£72). The formula packs a one-two-punch of vitamin C and glycolic acid, the latter of which helps get rid of any dead skin cells on the surface that might impede the vitamin C from doing its job — of brightening up your skin, that is. The funky, dual-chamber tube keeps the two ingredients separated, meaning you get a fresh dose of both with each pump.