Free Radical Scavenger. Contains 18% Oleuropein. This alcohol-free and non-GMO formula is a dietary supplement suitable for vegetarians and vegans. It is Kosher certified and made from botanicals/herbs. Family owned since 1968, NOW Foods ensures GMP Quality Assured. Olive leaves contain active compounds, mainly phenols and lignans, that protect the plant from environmental stress. Oleuropein, a well-known active constituent of Olive Leaf, exhibits powerful free radical scavenging activity.