Comvita Olive Leaf Immune DefenceHigh Strength Olive Leaf Extract Olive Leaf Extract is a rich source of antioxidant polyphenols Vitamin C can help support the normal functioning of the immune system Comvitas Olive Leaf Immune Defence combines two of natures well known ingredients Olive leaf Extract and Vitamin C, formulated for antioxidant and immune support. Olive Leaf Extract supports general wellbeing and Vitamin C can help reduce the duration and severity of common cold