Hydra-Pure® Vitamin C Serum promotes optimal skin function with a high-performance complex of Vitamin C. This nourishing serum contains three forms of Vitamin C to provide maximum efficacy. Vitamin C works in the lipid-soluble and water-soluble layers of the skin so this potent and effective serum has been created to deliver the appropriate form of Vitamin C to each layer of the skin. Vitamin C is singled out as the most potent anti-aging ingredient, requiring its own formula with multiple forms of Vitamin C to provide maximum benefits to the skin without irritation.