Standardized Olive Leaf is gluten-free and vegetarian, made from plant-derived capsules. It also contains no sugar, salt, yeast, wheat, soy, corn, dairy products, artificial colours, flavours or preservatives. Standardized Olive Leaf is gluten-free and vegetarian, made from plant-derived capsules. It also contains no sugar, salt, yeast, wheat, soy, corn, dairy products, artificial colours, flavours or preservatives. Olive extract (leaf) of 250mg and olive (leaf) of 180mg. Olive leaf is native to the Mediterranean, so that's where Nature's Way sources our Olive Leaf extract. The leaves are collected from the trees after the olive fruit harvest during the annual pruning process.