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Free radicals caused by pollution, UV rays and more can lead to wrinkles and dullness. “Vitamin C squelches those free radicals,” says Lisa Kellett, a Toronto-based dermatologist. Because of this superpower, vitamin C is best used in the morning, under sunscreen. Spend more: Skin Authority Super-C Serum, $139, contains a 20 percent concentration—considered an optimal dosage. Spend less: Vichy Liftactiv Vitamin C Brightening Skin Corrector, $45, is a 10-day treatment with 15 percent vitamin C.