Artichoke is popular for its pleasant bitter taste, which is attributed mostly to a plant chemical called cynarin found in the green parts of the plant. Cynarin is considered one of artichoke's main biologically active chemicals. Other documented "active" chemicals include flavonoids, sesquiterpene lactones, polyphenols and caffeoylquinic acids. Raintree Nutrition's Concentrated Artichoke Extract uses new and proprietary extraction methods to concentrate and preserve the active ingredients found in this wonderful plant. Concentration and extraction methods provide the equivalent of 500 mg of artichoke leaf and fruit per milliliter of extract.