Now ® Cats Claw is a dietary supplement containing powdered cats claw bark. Each vegetarian capsule contains 500 mg of bark obtained from the downy bark ( Uncaria tomentosa ), suitable as a supplement to the daily diet of adults. What is cats claw? Chapeta pufosa, commonly called vilcacora or cats claw, is a species of vine belonging to the madder family. It comes from the northwestern part of South America, Central America and the Caribbean. Cats claw is a herbal raw material, and its practical use is primarily the bark, which is valued for its health-promoting properties. Cats claw naturally contributes to maintaining the proper functioning of the immune system. The recommended daily dose of Cats Claw 500 mg Now ® Foods dietary supplement is 4-6 vegetable capsules per day. A 250-pack will provide up to two months of daily herbal support for the bodys immunity.