Photos of Uncaria tomentosa, Cat's Claw, Una de Gato.

Uncaria tomentosa, Una de Gato, Cat's Claw is a South American folk medicine for intestinal ailments, gastric ulcers, arthritis, wounds, and cancer. Popular use in North America started in the 1990s. Reports of successful use as a South American folk remedy for cancer prompted scientists to take a closer look. Proanthocyanidins were found to inhibit tumor growth in the 1970s. In 1985 researchers found several alkaloids in U. tomentosa root with significant immunostimulant activity. In 1993 researchers found new compounds, quinovic glycosides, which showed antiviral, antimutagenic, and antioxidant effects in preliminary pharmacological tests.

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