Cat's Claw

Introduction

This fact sheet provides basic information about the herbA plant or part of a plant used for its flavor, scent, or potential therapeutic properties. Includes flowers, leaves, bark, fruit, seeds, stems, and roots. cat's claw—common names, uses, potential side effects, and resources for more information. Cat's claw grows wild in many countries of Central and South America, especially in the Amazon rainforest. The use of this woody vine dates back to the Inca civilization.

Common Names—cat's claw, uña de gato

Latin Names—Uncaria tomentosa, Uncaria guianensis

What It Is Used For

* Cat's claw has been used for centuries in South America to prevent and treat disease.
* It has been used for a variety of health conditions, including viral infections (such as herpes and HIV), Alzheimer's disease, cancer, and arthritis.
* Cat's claw has been used to support the immune system and promote kidney health, as well as to prevent and abort pregnancy.

How It Is Used

The inner bark of cat's claw is used to make liquid extracts, capsules, and teas. Preparations of cat's claw can also be applied to the skin.

What the Science Says

* There is not enough scientific evidence to determine whether cat's claw works for any health problem, including arthritis, HIV, or cancer.
* Small studies in humans have shown a possible benefit of cat's claw in osteoarthritis and rheumatoid arthritis, but no large trials have been done. In laboratory studies, cat's claw stimulates part of the immune system, but it has not been proven to reduce inflammation or boost the immune system in humans.
* The National Institute on Aging is studying how cat's claw may affect the brain. Findings may point to new avenues for research in Alzheimer's disease treatment.

Side Effects and Cautions

* Few side effects have been reported for cat's claw when it is taken at recommended dosages. Though rare, side effects may include headaches, dizziness, and vomiting.
* Women who are pregnant or trying to become pregnant should avoid using cat's claw because of its past use for preventing and aborting pregnancy.
* Because cat's claw may stimulate the immune system, it is unclear whether the herb is safe for people with conditions affecting the immune system.
* Tell your health care providers about any complementary and alternative practices you use. Give them a full picture of what you do to manage your health. This will help ensure coordinated and safe care.

Black Cohosh

Introduction

This fact sheet provides basic information about the herbA plant or part of a plant used for its flavor, scent, or potential therapeutic properties. Includes flowers, leaves, bark, fruit, seeds, stems, and roots. black cohosh—common names, uses, potential side effects, and resources for more information. Black cohosh, a member of the buttercup family, is a plant native to North America. It was used in Native American medicine and was a home remedy in 19th-century America.

Common Names—black cohosh, black snakeroot, macrotys, bugbane, bugwort, rattleroot, rattleweed

Latin Names—Actaea racemosa, Cimicifuga racemosa

What It Is Used For

* Black cohosh has a history of use for rheumatism (arthritis and muscle pain) but has been used more recently to treat hot flashes, night sweats, vaginal dryness, and other symptoms that can occur during menopause.
* Black cohosh has also been used for menstrual irregularities and premenstrual syndrome, and to induce labor.

How It Is Used

The underground stems and roots of black cohosh are commonly used fresh or dried to make strong teas (infusions), capsules, solid extracts used in pills, or liquid extracts (tinctures).

What the Science Says

* Study results are mixed on whether black cohosh effectively relieves menopausal symptoms. An NCCAM-funded study found that black cohosh, whether used alone or with other botanicals, failed to relieve hot flashes and night sweats in postmenopausal women or those approaching menopause.
* Most studies to date have been less than 6 months long, so the safety of long-term use is unknown.
* NCCAM is funding studies to further understand the potential effects of black cohosh on hot flashes and other menopausal symptoms.
* There are not enough reliable data to determine whether black cohosh is effective for rheumatism or other uses.

Side Effects and Cautions

* Black cohosh can cause headaches and stomach discomfort. In clinical trials comparing the effects of the herb and those of estrogens, a low number of side effects were reported, such as headaches, gastric complaints, heaviness in the legs, and weight problems.
* No interactions have been reported between black cohosh and prescription medicines.
* Black cohosh has been linked to a few cases of hepatitis (inflammation of the liver), but it is not clear whether black cohosh caused the problem.
* It is not clear if black cohosh is safe for women who have had breast cancer or for pregnant women.
* Black cohosh should not be confused with blue cohosh (Caulophyllum thalictroides), which has different properties, treatment uses, and side effects than black cohosh. Black cohosh is sometimes used with blue cohosh to stimulate labor, but this therapy has caused adverse effects in newborns, which appear to be due to blue cohosh.
* Tell your health care providers about any complementary and alternative practices you use. Give them a full picture of what you do to manage your health. This will help ensure coordinated and safe care.