This antioxidant-rich serum combines time released vitamin C with a blend of botanicals to treat acne, rosacea, contact dermatitis and even insect bites. Olive leaf extract works with the vitamin C (L-ascorbic acid) to provide maximum antioxidant protection and health-promoting benefits. Zinc sulfate reduces inflammation, kojic acid prevents blemishes and vitamins E and A condition, nourish and neutralize free radicals. Pro-Heal Serum Advance+ offers iS Clinical's highest levels of antioxidant protection, making it ideal for sensitive, and compromised skin types.