Cat’s Claw

Supplements · Immune & Antimicrobial Herbs · Supplement, Typed Supps

A rainforest vine used traditionally to calm inflammation — with real but small evidence for one specific use.

Stage by stage

Intake (Extract capsule): Active alkaloid compounds absorbed in the small intestine.
Small intestine (Absorbed): Absorbed alongside other plant compounds.
Bloodstream (Circulates): Circulates with antioxidant and immune-related activity.
Inflammatory pathways (Preliminary research): Studied for effects on inflammatory pathways, though most research is still preliminary.

What the evidence supports

Reducing joint pain and swelling in rheumatoid arthritis — limited evidence. Small randomised trials of a pentacyclic-alkaloid-standardised extract, used as an add-on to conventional drugs, reduced tender and swollen joints, but the trials are few and small.
Boosting general immune function — insufficient evidence. Immune-stimulating effects are seen mainly in laboratory and animal studies; controlled human evidence for a meaningful immune benefit is lacking.

Typical dose

Rheumatoid arthritis trials used roughly 20–60 mg/day of an extract standardised to pentacyclic oxindole alkaloids; whole-bark products are dosed far higher

Upper limit: No established UL

Timing

With food, standard dosing.

Time to effect

Weeks: Any reported effect in studies.

Medication interactions

Immunosuppressants (e.g. ciclosporin, corticosteroids): Its immune-stimulating action may counteract drugs whose job is to suppress the immune system. (moderate)

Common myth

“Cat’s claw is a well-established immune treatment.” In reality: Much of the supporting research is preliminary or small-scale — it hasn’t reached the evidence level of many other immune-related supplements.