Cat's Claw (Uncaria) for Antioxidant Support

Research suggests that Cat's Claw (Uncaria tomentosa and related species) possesses meaningful antioxidant activity, with studies demonstrating free radical scavenging capacity, protection of cells from oxidative damage, and the presence of polyphenols and proanthocyanidins as likely key bioactive compounds. The available evidence comes predominantly from in vitro laboratory studies, animal models, and narrative reviews, with multiple studies directly measuring antioxidant activity through established assays such as DPPH, ABTS, and FRAP, all pointing in a supportive direction. Studies indicate that antioxidant activity may work alongside other mechanisms — particularly TNF-alpha suppression and NF-κB inhibition — rather than serving as the plant's sole or primary mode of action, and that preparation method appears to matter, with concentrated freeze-dried extracts showing greater potency than other forms. The overall body of evidence is consistent and encouraging, though researchers across multiple reviews note that the field still lacks robust clinical trials in humans, and further rigorous investigation is needed before firm conclusions can be drawn about the magnitude or practical significance of these effects in people.