‘Sacred bark’ used as a natural laxative

Native Americans in the Pacific Northwest first began using cascara sagrada, or sacred bark, hundreds of years ago. When dried and aged for a year, the bark of Rhamnus purshiana, a tree related to the California buckthorn, becomes an effective stimulant laxative, meaning it causes the intestinal muscles to contract. The plant’s active ingredients are found in some over-the-counter laxatives.

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Uses: Cascara sagrada is used to treat constipation; empty the bowels before surgery or an exam; and soften the stool in hemorrhoid sufferers. In folk medicine, the herb is sometimes taken for gallstones.

Dose: From 400 to 800 milligrams a day in pill form, taken on an empty stomach with water, often at bedtime. Or two cups of tea daily, made with two grams of the herb per cup. The herb should not be used for more than seven to 10 days.

Precautions: Cascara sagrada can cause cramps and diarrhea. Taking the herb for more than two weeks can damage the intestines and lead to dehydration, potassium deficiency, muscle weakness and heart arrhythmias. The herb should not be taken with licorice root or steroids, which can lower potassium levels. People who are dehydrated or suffer from irritable bowel syndrome, Crohn’s disease or colitis should avoid the herb. Fresh cascara can cause intestinal spasms and bloody diarrhea.

Research: Human studies have shown that cascara sagrada is an effective laxative. Results from some research suggest a few of the bark’s components may have antiviral and antibacterial properties, but these have not been confirmed.

Dietary supplement makers are not required by the U.S. government to demonstrate that their products are safe or effective. Ask your healthcare provider for advice on selecting a brand.

-- Elena Conis