Cat's Claw: Uses, Benefits, Dosage & Safety
Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
Quick summary
Cat's claw is an Amazonian vine used for joint pain and immune support. It has some evidence for osteoarthritis and rheumatoid arthritis symptoms, but quality varies and it has real interactions.
What is Cat's Claw?
Cat's claw (Uncaria tomentosa) is a woody vine from the Amazon, named for its claw-like thorns. Its bark and root contain alkaloids and is used traditionally and in supplements for joint pain, arthritis and immune support.
What Cat's Claw is commonly used for
In supplements, Cat's Claw is most often included for joint & bone health support. It is used as nutritional support, not as a treatment for any medical condition — the distinction matters, because the claims on a sales page are often stronger than the evidence allows.
How Cat's Claw works
Cat's claw's alkaloids and other compounds have anti-inflammatory and immune-modulating activity, which is the basis for its joint and immune use. Two chemotypes exist with different alkaloid profiles, so product composition varies.
What the evidence says
Here's an honest snapshot of what published research suggests about Cat's Claw — including where the evidence is limited.
- Some small trials suggest cat's claw can reduce pain in osteoarthritis and ease symptoms in rheumatoid arthritis when added to standard care. (PubMed research)
- Evidence is limited and product variability makes results harder to generalise. (PubMed research)
Typical dosage used in studies
Studies have used roughly 100-300 mg/day of standardised extract, or higher amounts of bark. This is research information for context, not a recommendation — confirm what's appropriate for you with a healthcare professional.
Side effects and safety
Generally tolerated; possible digestive upset, dizziness or headache. Its immune-stimulating activity is relevant to autoimmune conditions.
Medication interactions and who should avoid Cat's Claw
Medication & safety check
It may interact with immunosuppressants, blood thinners, blood-pressure medication and drugs processed by the liver. Avoid in autoimmune disease, pregnancy and before surgery without advice.
This is general information, not personal medical advice. If you take any medication, confirm it's safe to combine with Cat's Claw with your doctor or pharmacist first.
Sources & further reading
The summary above is drawn from peer-reviewed research and authoritative references. For general, authoritative background you can also consult:
- PubMed research on Cat's Claw
- NIH Office of Dietary Supplements
- NIH National Center for Complementary and Integrative Health
- MedlinePlus (U.S. National Library of Medicine)
Frequently asked questions
Does cat's claw help joints?
Some small studies suggest it eases osteoarthritis and rheumatoid arthritis symptoms.
Is cat's claw safe?
Generally tolerated; it stimulates the immune system, which matters for autoimmune conditions.
Who should avoid it?
People with autoimmune disease, on immunosuppressants or blood thinners, or pregnant.
Does product quality vary?
Yes — different chemotypes mean composition and effects can differ.
Related ingredients to explore
Ingredients often studied or formulated alongside Cat's Claw — useful for understanding the full picture of a formula.