A 15 percent vitamin C serum boosted with caffeine to visibly brighten, reduce hyperpigmentation, even tone, firm the look of skin, and depuff. Elevate your morning routine. This first-of-its-kind clinical-grade 15% vitamin C serum is boosted with clean, plant-derived caffeine from superleafs yerba mate and guayusa to immediately brighten, visibly reduce morning puffiness, and hydrate.