Vitamin C and Hyaluronic Acid Booster/Facial Serum: 10% COMPLEX CTH, a unique combination of three concentrated forms of vitamin C – lipophilic, liposomal, and hydrophilic C5300 – and SVCT-1 transporters that stimulate the transport of vitamin C directly into skin cells. It is responsible for brightening, energizing, and antioxidant properties. This serum for mature skin works