Uncaria tomentosa Identity & Plant Part
The botanical entity is Uncaria tomentosa (Willd. ex Schult.) DC., uña de gato, a climbing vine of the Rubiaceae whose paired thorns give it the claw name. The part used is the bark of the stem. Leaves, roots and whole-vine material are not part of this ingredient.
The identity point buyers meet most often is the second claw species. Uncaria guianensis is a different plant, sold under the same common name, and its alkaloid profile differs. Cat’s Claw bark carries oxindole alkaloids, polyphenols and glycosides, named only as constituent families. Alkaloid type matters in this species, which is why a bare extract name leaves the specification open. Bark is the part with the long record of trade under this name, and it is the part this extract is made from.












