Standardized Extract. Supports Liver and Cholesterol Metabolism. Artichoke 500 Extract is standardized to contain 5% total caffeoylquinic acids. Clinical research has documented the following beneficial properties of artichoke extract:. Liver Function - Protects glutathione levels. Stimulates liver activity by promoting circulation within the liver. Digestion - Stimulates synthesis of bile a product of the liver that supports detoxification and the absorption of fat-soluble nutrients.