Cat’s claw is a large, woody vine native to tropical rain forests in Central and South America. The liana has long, claw-like thorns that allow it to climb more than 100 feet into the tree canopy. Because of this, cat’s claw is not easily cultivated and must be wild harvested.

Indigenous healers have used cat’s claw bark for centuries to promote healing and treat intestinal distress. The herbal medicine was essentially unknown to the rest of the world before the 1970s. Today, cat’s claw bark, cut and sifted, is used for teas to support the immune system. The plant has anti-inflammatory properties for treating joint problems, and as an antioxidant, cat’s claw is being studied as a potential cancer treatment.

Because of possible effects on the immune system, cat’s claw should not be used by those with autoimmune conditions or taking immunosuppressive or blood pressure medications.