There are more than 3,000 five-star reviews (and 200,000 loves) for this Olehenriksen Truth Serum ($24-$74), which includes a vitamin C complex (to brighten) along with collagen (to boost elasticity) and aloe juice (to soften). Other Sephora shoppers rave about how well it works to reduce the appearance of all sorts of dark spots, from age spots to acne scars.