There’s almost nothing that topical vitamin C doesn’t claim to do—from alleviating acne and lightening dark spots to improving overall skin tone and texture (and stopping just short of making 401(k) contributions).In our five months of reporting for this guide, we found the research to be far more measured. Topical vitamin C is actually better at preventing discoloration, dullness, and lines than it is at reversing them: It’s a powerful antioxidant that can deactivate pesky free radicals, which can contribute to signs of aging.To find the best options, we considered dozens of formulas—serums, lotions, and drops—and we tried 34 of them over several months. Then we sent 20 strong contenders (with their labels hidden) to three testing panels, which included people of different ages and with diverse skin types. In the end, we arrived at six standouts, including a splurge-y, category-launching classic, a plush, moisturizing formula, an impressive budget option, and more. We’re confident you’ll find something here that you will enjoy applying every morning.