What it is: An antioxidant-rich serum with powerful 15% L-ascorbic acid plus lactic acid to visibly improve signs of aging. Who it's for: All skin types.What it does: Vitamin C is an essential vitamin that helps visibly improve skin density and is associated with healthy collagen levels. Lactic acid serves as a powerful delivery vehicle for other ingredients, as it increases their penetration into the skin, and thus their efficacy.Research results: Clinically proven after 12 weeks to reduce the appearance of fine lines and wrinkles (24 subjects) and visibly improve sagging skin and the feel of skin firmness (30 subjects). Patient satisfaction of 6 subjects 85% saw visible improvement in sun aging after 4 weeks. How to use: Once daily, apply 4-6 drops as an all-over treatment on clean, dry skin. May cause a slight tingling sensation until skin is acclimated. 1 fl. oz. Cruelty-free Paraben-free; sulfate-free Made in the USA