Cat's claw is a woody vine native to the Amazon rainforest, long used in traditional medicine. Its inner bark supplies alkaloids and antioxidants that help regulate immune activity and inflammation.
People take it to maintain immune function and relieve occasional joint discomfort. Some use it for digestive support. Common forms include standardized extracts, capsules, and tea made from the dried bark.
The herb can slow blood clotting and lower blood pressure, so it may interact with anticoagulant and antihypertensive drugs. Pregnant women should avoid it due to possible uterine stimulation. Those with autoimmune conditions or on immunosuppressants should speak with a healthcare professional.