Cat's Claw

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Photo copyright Steven Foster

 

Common name:

• Uña de Gato

Botanical Names

Botanical name:

• Uncaria tomentosa

Parts used and where grown

Cat's claw grows in the rain forests of the Andes Mountains in South America, particularly in Peru. The two species of the plant used most commonly are U. tomentosa, which makes up most of the cat's claw imported to the U.S., and U. guianensis, which is more widely used in Europe. In South America, both species are used interchangeably. The root bark is used as medicine.

Health Concerns

 

Cat's claw has been used in connection with the following conditions (refer to the individual health concern for complete information):

Rating	Health Concerns
	Osteoarthritis
	Rheumatoid arthritis
	HIV support Immune function
Reliable and relatively consistent scientific data showing a substantial health benefit. Contradictory, insufficient, or preliminary studies suggesting a health benefit or minimal health benefit. An herb is primarily supported by traditional use, or the herb or supplement has little scientific support and/or minimal health benefit.

Traditional Use

Historical or traditional use (may or may not be supported by scientific studies)

Cat's claw has been reportedly used by indigenous peoples in the Andes to treat inflammation, rheumatism, gastric ulcers, tumors, dysentery, and as birth control.¹ Cat's claw is popular in South American folk medicine for treating intestinal complaints, gastric ulcers, arthritis, and to promote wound healing.

Active Constituents

Active constituents

According to test tube studies, oxyindole alkaloids in cat's claw stimulate immune function.² Alkaloids and glycosides in cat's claw have also demonstrated anti-inflammatory and antioxidant activity.^{3, 4}

Although clinical trials are lacking, cat's claw has become very popular in North America and is sometimes recommended for people with cancer or HIV infection. A cigarette smoker who took a freeze-dried extract of cat's claw root bark for one month showed a sharp decrease in one urinary cancer marker.⁵ This finding, however, does little to support the use of the herb in persons with cancer and points toward the need for actual clinical studies to determine its effectiveness.

Cat's claw has been used traditionally for osteoarthritis and rheumatoid arthritis. Double-blind trials have confirmed the effectiveness of cat's claw for each of these conditions.^{6, 7}

Dosage

How much is usually taken?

In a study of patients with osteoarthritis, 100 mg per day of a freeze-dried preparation was used. Cat's claw tea is prepared from 1/4 teaspoon (1 gram) of root bark by adding 1 cup (250 ml) of water and boiling for ten to fifteen minutes. Cool, strain and drink one cup three times per day. Alternatively, 1/4-1/2 teaspoon (1-2 ml) of tincture can be taken up to two times per day, or 20-60 mg of a dry standardized extract can be taken once per day.⁸

Side Effects

Are there any side effects or interactions?

Although no serious adverse effects have been reported for cat's claw, there is little known about its safety because most reports have been based on anecdotal evidence. Cat's claw should be used with caution in people with autoimmune illness, multiple sclerosis, and tuberculosis. Until proven safe, cat's claw should not be taken by pregnant or breast-feeding women.

At the time of writing, there were no well-known drug interactions with cat's claw.

References

1. Foster S. Herbs for Your Health. Loveland, CO: Interweave Press, 1996, 18-9.
2. Keplinger H. Oxyindole alkaloids having properties stimulating the immunologic system and preparation containing same. US Patent no. 5,302,611, April 12, 1994.
3. Aquino R, De Feo V, De Simone F, et al. Plant metabolites, new compounds and anti-inflammatory activity of Uncaria tomentosa. J Nat Prod 1991;54:453-9.
4. Rizzi R, Re F, Bianchi A, et al. Mutagenic and antimutagenic activities of Uncaria tomentosa and its extracts. J Ethnopharmacol 1993;38:63-77.
5. Rizzi R, Re F, Bianchi A, et al. Mutagenic and antimutagenic activities of Uncaria tomentosa and its extracts. J Ethnopharmacol 1993;38:63-77.
6. Piscoya J, Rodriguez Z, Bustamante SA, et al. Efficacy and safety of freeze-dried cat's claw in osteoarthritis of the knee: mechanisms of action of the species Uncaria guianensis. Inflamm Res 2001;50:442-8.
7. Mur E, Hartig F, Eibl G, Schirmer M. Randomized double blind trial of an extract from the pentacyclic alkaloid-chemotype of Uncaria tomentosa for the treatment of rheumatoid arthritis. J Rheumatol 2002;29:678-81.
8. Foster S. Herbs for Your Health. Loveland, CO: Interweave Press, 1996, 18-9.

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Last Review: 01-21-2009

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The information presented in Aisle7 is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires February 2010.

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