SkinCeuticals Phloretin CF is an antioxidant serum formulated for daily use on normal, oily, and combination skin, neutralizing free radicals and preventing the signs of premature skin aging. Phloretin is an antioxidant that neutralizes free radicals, improves cell renewal and the appearance of discoloration. Vitamin C neutralizes free radicals and protects the skin against oxidative stress, for a visible anti-aging effect.