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iS Clinical Pro-Heal Serum Advance + | Vitamin C Serum 15ml/30ml. PRO-HEAL SERUM ADVANCE + Featuring our scientifically advanced Vitamin C time release technology combined with a superior form of olive leaf extract and pure vitamins A & E this clinically proven formula delivers our highest-ever antioxidant protection and exceptional healing properties.. It helps boost your skin's natural healing process, reduce redness, and restore vibrancy and clarity to your skin.