Originating in the Amazon rainforest, cat's claw, also known as una de gato, is a woody vine named for the sharp, curved thorns found on its stems. Cat's claw has a history of use dating back to the ancient Incan civilizations and has been used traditionally to help support a number of potential health benefits. Solaray only uses the inner bark portion of the vine which has been the subject of clinical research. Like all Solaray products, Cats Claw is lab verified for potency, purity, and identity.