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Vitamins Information (Home) > Herbs > Oregon Grape
Information on Oregon GrapeBotanical name: Berberis aquifolium. Oregon grape is an evergreen shrub which grows throughout the American northwest. It is somewhat misnamed, as the fruit are not actually grapes. It is, however, grown in Oregon (it is the official state flower). Oregon grape is a close relative of barberry (Berberis vulgaris), and shares many common uses and constituents. The root is used medicinally. Oregon grape has been used in connection with chronic candidiasis, conjunctivitis/blepharitis, diarrhea, infection, parasites, poor digestion, psoriasis, and urinary tract infections. Before European colonists arrived, the indigenous peoples of North America treated all manner of complaints with Oregon grape. The berries were used for poor appetite. A tea made from the root was used to treat jaundice, arthritis, diarrhea, fever, and many other health problems. Active constituents: Alkaloids, including berberine, berbamine, canadine, and hydrastine, may account for the activity of Oregon grape.Isolated berberine has been shown to effectively treat diarrhea in patients infected with E. coli. One of the ways berberine may ease diarrhea is by slowing the transit time in the intestine. Berberine inhibits the ability of bacteria to attach to human cells, which helps prevent infections, particularly in the throat, intestines, and urinary tract. These actions, coupled with berberine’s ability to enhance immune cell function, make Oregon grape possibly useful for mild infections although clinical trials are lacking on the whole root. In one clinical trial, an ointment of Oregon grape was found to be mildly effective for reducing skin irritation, inflammation and itching in people with mild to moderate psoriasis. Whole Oregon grape extracts were shown in one pharmacological study to reduce inflammation (often associated with psoriasis) and stimulate the white blood cells known as macrophages. In this study, isolated alkaloids from Oregon grape did not have these actions. This suggests that something besides alkaloids are important to the properties of Oregon grape responsible for reducing inflammation. The bitter-tasting compounds as well as the alkaloids in Oregon grape root are thought to stimulate digestive function. A tea can be prepared by boiling 1–3 teaspoons (5–15 grams) of chopped roots in 2 cups (500 ml) of water for fifteen minutes. After straining and cooling, 3 cups (750 ml) can be taken per day. Tincture, 1/2–3/4 teaspoon (3 ml) three times per day, can be used. Since berberine is not well absorbed, Oregon grape root might not provide adequate amounts of this compound to treat significant systemic infections. A physician should be consulted in the case of infection before attempting to use Oregon grape. An ointment made with 10% Oregon grape extract applied three or more times daily may be useful for psoriasis. Oregon grape is thought to be safe in the amounts indicated above. Long-term (more than two to three weeks) internal use is not recommended. Berberine alone has been reported to interfere with normal bilirubin metabolism in infants, raising a concern that it might worsen jaundice. For this reason, berberine-containing plants should be used with caution during pregnancy and breast-feeding. Certain medications may interact with Oregon grape. Refer to the drug interactions safety check for a list of those medications. VISITOR COMMENTS on "Herb Oregon Grape": 
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