This powerful, clinically-proven age-defying formula is excellent for calming and soothing skin reactions in addition to promoting clear, nourished skin. Pro-Health Serum incorporates a 15% concentration of scientifically advanced L Ascorbic Acid (Vitamin C), a superior form of Olive Leaf Extract, Tocopherol (Vitamin E), and Retinol (Vitamin A), which act synergistically to provide maximum levels of antibacterial, antimicrobial , and antioxidant protection.