Uncaria Tomentosa Traditional Adaptogenic Herb From The Amazon Supports Your Body’s Natural Defenses Against Disease Dietary Supplement Scientific evidence: Numerous published studies suggest that Uncaria tomentosa promotes killer T-cell production, supports repair of DNA in cells & inhibits C-reactive protein. These impressive research results were obtained from Cat’s Claw as it comes from nature, containing all of its alkaloids, both POA & TOA.