Counteract serious sun damage with these intensive treatments from Citrix. The CRS series of serums combines pure and stable L-ascorbic acid with TGF-beta-1 growth factor to correct the damage caused to DNA and skin cells by environmental factors such as the sun, pollution and cigarette smoke. For those with dry skin, choose emollient Citrix Antioxidant Cream to boost collagen production for firmer, healthier skin.