Cat's claw is a shrub with thick vines that can grow up to 100 feet in length. It grows in the rain forests of Central America and South America, particularly Peru, where it is known as una de gato. The plant's stems contain a bitter, water-like liquid and are dotted with curved, claw-like thorns that give cat's claw its name.
Cat's claw preparations are made by scraping the bark off the root of the plant's vine. The roots and bark contain various chemicals, including tannins, oxyindole alkaloids and glycosides, which are believed to stimulate the immune system and have anti-inflammatory and antioxidant properties. The effectiveness of the roots and bark's medicinal properties depend on the time of the year in which the plant is harvested.
In South America, cat's claw is popular for treating inflammation, ulcers and arthritis, and to promote wound healing. In the U.S., it is used to combat cancer and HIV infections. One study of cigarette smokers found that subjects taking a cat's claw extract showed lower amounts of mutagens in their urine. Other studies using cat's claw extract have shown lower infection rates and improved CD4 cell counts in patients with HIV.
For mild stomach pains and sore throats, and to improve immune function, the following doses are recommended:
Cat's claw is available in the raw root/bark form, as well as in capsules, extracts and tinctures.
The American Herbal Products Association has given cat's claw a class 4 safety rating, which means there isn't enough evidence on which to base a definitive safety rating. However, the AHPA has stated that the tannin content of cat's claw may cause abdominal pain or intestinal problems if taken in high doses. It is also not recommended for children under age three, or women who are pregnant or lactating.
In addition, some practitioners believe cat's claw interferes with certain drugs that stimulate the immune system. Therefore, it should not be used in patients receiving skin grafts or organ transplants, or in patients with HIV, AIDS or tuberculosis. Furthermore, patients should not use cat's claw if they have received the following treatments recently: vaccinations; fresh or frozen blood plasma; drugs that use animal proteins or peptide hormones; intravenous hyperimmunoglobulin therapy; intravenous thymic extracts; bovine insulin; or porcine insulin. As always, make sure to consult with a licensed health care provider before taking cat's claw or any other herbal remedy or dietary supplement.
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