Comvita Olive Leaf Complex & Aloe Vera 500ml. High quality olive leaf extracts contain around 100 naturally occurring compounds. At least twelve of these compounds are known to be powerful antioxidants. Oleuropein is the most commonly measured antioxidant in olive leaves, however it is not the only one Made from fresh leaves. It does not contain any olive leaf extract powders or artificially boosted oleuropein products. The addition of Aloe Vera helps to maintain healthy immune & digestive systems.