Best For All Skin Types. Eminence Citrus & Kale Potent C+E Serum delivers a nourishing cocktail of vitamins and antioxidants to correct discoloration, provide powerful protection, and reverse signs of aging. This collagen-boosting formula contains 16% vitamin C to combat oxidative stress while ferulic acid and leafy greens stabilize the vitamin C as well as provide additional antioxidant defense. With a non-greasy, lipid base, Eminence Citrus & Kale Potent C+E Serum absorbs quickly for a clear, radiant, and youthful complexion.