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Though it has been used for centuries, its fame really began in the 1960s. Dr. Theodore Meyer learned about the use of pau d’arco (pronounced powdy arco) by natives of the tropical rain forest of the Amazon. They had used the inner bark of this hardwood tree as a medicine. Dr. Meyer followed their lead and claimed he successfully cured five advanced cases of leukemia with it.

The herb suddenly rose to fame! A decade later however, the National Cancer Institute determined that the quantity needed of the cancer curing drug in pau d’arco would have too many dangerous side effects. As a result, the “miracle drug” lost its place of prestige.

In spite of this negative report, pau d’arco has since been used successfully to treat such things as fevers, arthritis, infections, malaria, skin problems, cancers, and even complications of AIDS. Two reasons for the discrepancy between the research and reality are these.

The pau d’arco tree is an evergreen tree that grows in the warm parts of Central and South America. It is a broad-leaf evergreen that grows to a height of 125 feet and has pink to violet-colored flowers. Its extremely hard wood makes it resistant to disease and decay. The inner bark of the tree is used medicinally. In recent years there has been an increasing demand for pau d’arco and, as a result, the trees are endangered.

Pau d’arco has certain anti-inflammatory and anti-viral activity, including against herpes I and II. It may reduce viral replication, according to a report in the Proceedings of the National Academy of Sciences.

Pau d’arco is sold as tablets, dried bark tea, and tincture (which contains alcohol). The chemicals that give pau d’arco its medicinal effects dissolve poorly in water, so a tea is not recommended.

Early reports declared pau d’arco to be useful in treating leukemia and other cancers, but the National Cancer Institute’s research into lapachol (the constituent with the most anti-tumor activity) was halted due to mild side effects. More recent lab tests in Korea determined that another constituent, beta-lapachone, kills cancer cells of the lung, colon, and prostate. Pau d’arco is some time away from being used to treat cancer, but the Incas may have been on the right track.

Dosage In tablets or capsules, 1 to 4 grams per day in divided doses–or 1 to 2 teaspoons of tincture three times a day. Consuming 1.5 grams per day or more may cause dizziness and GI upset, so consult your herbalist. Avoid pau d’arco if you’re taking anticoagulants or having surgery, or if you are pregnant or nursing.

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