Cat's Claw
What the trials found
Cat’s claw does not have clear, proven benefits for everyday immune or inflammation outcomes, while limited human evidence and reported medication interactions make self-directed use a poor choice.
- 2 papers
- 0 of 14 outcomes
- 2 severe, 10 major interactions
Risk, worst reported severity
- neutropenia (grade 3 or 4) severe
- acute allergic interstitial nephritis severe
- oxaliplatin major
- dasatinib major
Dose, timing & forms
How much
There is no well-supported consumer dose range for cat's claw because clinical evidence does not establish a dependable benefit for common immune or inflammation goals.1 Do not assume that a larger dose improves results. With serious interaction concerns, a clinician should guide any use.
When and how long
No clinical protocol establishes a best time of day, food rule, or split-dose schedule for routine cat's claw use.1 Consistency does not solve the bigger issue: a reliable benefit and safe self-directed regimen have not been established.
Forms & standardisation
Capsules, tinctures, teas, and extracts can differ widely in plant part, extraction method, and chemical profile. A label that names Uncaria tomentosa is more informative than one that only says “cat's claw,” but standardization does not turn limited clinical evidence into proof of benefit.1
Adverse events and drug interactions
Safety events
Drug interactions
What this is and how it works
- Human evidence does not establish a reliable benefit for immune or inflammation outcomes.1
- Two papers reviewed here span 14 outcomes, with no strongest outcome supported by a clear consumer-facing claim.
- Reported serious adverse effects and interactions particularly concern cancer treatments and immune-suppressing medicines.
Cat's claw comes from Uncaria tomentosa, a woody vine that climbs through tropical forests in Central and South America. Its hooked thorns give the plant its name, while extracts from its bark and root appear in capsules, teas, and tinctures.
Cat's claw contains plant compounds that researchers are exploring for effects on immune-cell signaling and inflammatory messengers. Think of these signals as group texts that tell immune cells when to rally or stand down, but human trials have not established a dependable real-world effect from cat's claw supplements.1
Bottom line
Cat's claw is not a strong pick if you want a supplement with clear, proven results for everyday immune or inflammation support. Skip self-directed use if you take prescription medicines, particularly cancer treatments or immune-suppressing medicines, and speak with a clinician first because serious interactions and severe adverse effects have been reported.
Common questions
What is cat's claw used for?
Does cat's claw support the immune system?
Who should avoid cat's claw?
Sources
Sources
Generated August 27, 2026