Bluebonnet’s Standardized Cats Claw Bark Extract Vcaps provide a highly advanced plant extract standardized to 3% alkaloids (6 mg/serving) and 15% polyphenols (30 mg/serving) from pure cat’s claw bark extract. Plus e-d-s, an enzyme delivery system from 100% plant sources. Available in easy-to-swallow vegetable capsules for maximum assimilation and absorption.