This product from Cellex-C is for those patients who desire to start a skin rejuvenation program but suffer from sensitive skin conditions. Contains the same active ingredients as in the High Potency Serum, but has only 7.5% Vitamin C (L-ascorbic acid) versus 10% in the High Potency and 17.5% in the Advanced-C. Also contains tyrosine and zinc sulfate, hyaluronic acid and bioflavanoids. This serum has been buffered, meaning its less acidic, so is easier for people with sensitive skin to tolerate