Cellex C’s formula of L-ascorbic acid, zinc and tyrosine are scientifically proven to visibly improve the condition of the skin, reverse damage and protect it from future damage. Because the CellexC complex is patented no other manufacturer can legally use this formulation of ingredients and therefore cannot produce the same level of results. In addition, there are 3 independent studies that scientifically document the efficacy of Cellex-C’s patented formulation. It is one of our most popular skin care lines, free shipping on all Cellex-C products!