Resist Ultra-Light Super Antioxidant Concentrate Serum goes to work immediately to provide sheer hydration and an exclusive mix of antioxidants and grape-derived resveratrol. Together with skin-restoring ingredients—hyaluronic acid and pore-improving niacinamide—this serum provides visible results, yet is so light, you won’t even know it’s there! C15 Super Booster’s high concentration of vitamin C works in synergy with this serum to bring about remarkable results on an uneven skin tone and wrinkles, and helps to restore a firm feeling to skin.