Superior antioxidant protection When paired together, Vitamin C, Vitamin E, and Ferulic Acid are clinically proven to provide superior antioxidant protection. Our pure l-ascorbic acid (vitamin C) is formulated at an acidic pH between the 2.20-3.20 pH range and has a concentration of 15%, which exceeds all of the criteria to be extremely effective. Why are antioxidants important? Antioxidants neutralize damaging free radicals, which contribute to premature aging. Learn how.   Key Facts Vitamin C E + F serum has a unique combination of pure l-ascorbic acid (Vitamin C), Vitamin E, and Ferulic Acid that is clinically proven to provide superior antioxidant protection and brighten the appearance of the complexion. Provides advanced environmental protection against damaging free radicals and has shown increased protection when layered underneath a broad-spectrum sunscreen. Combined Hyaluronic Acid and Acetyl Octapeptide-3 work together to visibly plump and smooth the skin. This unique formula minimizes signs of hyperpigmentation and reduces the appearance of fine lines.