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Benefits of Cat's Claw

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Evidence-Based Benefits

  • Rheumatoid arthritis — Mur et al. (2002, n=40) found 60mg/day cat's claw extract (POA-standardized) significantly reduced the number of painful joints vs. placebo over 24 weeks in RA patients on sulfasalazine
  • Osteoarthritis — Piscoya et al. (2001, n=45) demonstrated that freeze-dried cat's claw (100mg/day) significantly reduced knee OA pain within 1 week compared to placebo
  • NF-kB inhibition — in vitro studies show cat's claw alkaloids and quinovic acid glycosides potently inhibit NF-kB activation, a master regulator of inflammatory gene expression
  • TNF-alpha suppression — pentacyclic oxindole alkaloids reduce TNF-alpha production by monocytes and macrophages, lowering systemic inflammatory signaling
  • Antioxidant activity — cat's claw contains proanthocyanidins and other polyphenols that scavenge free radicals and reduce oxidative stress markers

What the Research Says

Cat's claw has a long history in traditional Amazonian medicine and a small but growing body of clinical evidence. The most notable RA trial (Mur et al., 2002, n=40) found 60mg/day POA-standardized extract significantly reduced painful and swollen joints in patients already on sulfasalazine. For OA, Piscoya et al. (2001, n=45) demonstrated rapid pain relief within one week. Mechanistically, pentacyclic oxindole alkaloids inhibit NF-kB and suppress TNF-alpha production. An important distinction exists between pentacyclic (anti-inflammatory) and tetracyclic (immune-stimulating) alkaloid chemotypes — quality products should specify POA content. More large-scale trials are needed to establish definitive efficacy.

Related Conditions

Rheumatoid ArthritisOsteoarthritisInflammation
Full Cat's Claw Guide

References

  1. (). Randomized double blind trial of an extract from the pentacyclic alkaloid-chemotype of Uncaria tomentosa for the treatment of rheumatoid arthritis. Journal of Rheumatology.
  2. (). Efficacy and safety of freeze-dried cat's claw in osteoarthritis of the knee: mechanisms of action of the species Uncaria guianensis. Inflammation Research. DOI
  3. (). Anti-inflammatory and antioxidant activities of cat's claw (Uncaria tomentosa and Uncaria guianensis) are independent of their alkaloid content. Phytomedicine. DOI