Serum for cellular DNA protection, collagen booster, for skin brightening and pigmentation with vitamin C. Et-vitamin C is a multifunctional vitamin C derivative that effectively brightens, provides antioxidant protection, and repairs free radical damage. It also acts as a collagen booster. Its stability is superior to other ascorbic acid derivatives. It has a strong melanogenesis inhibitory effect, reducing dark spots and age spots. It fights photoaging by preventing inflammatory cytokines and inhibiting ROS production.