Pau D'Arco

What Should You Know About It?

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Pau d'arco (Tabebuia impetiginosa and Tabebuia avellanedae) is a type of tree native to the rainforests of Central and South America. In herbal medicine, extracts of the bark of the pau d'arco tree have long been used to treat a range of health problems. Now widely available in dietary supplement form, pau d'arco extract is said to offer a number of health benefits.

Pau d'arco contains many compounds thought to influence health, including quercetin (a type of antioxidant) and anthraquinones (a substance with laxative effects).

Benefits of Pau D'Arco

To date, research on the health effects of pau d'arco is lacking. However, there's some evidence that pau d'arco may offer certain benefits. Here's a look at several key study findings:

1) Cancer

In a report published in the Journal of Ethnopharmacology, scientists reviewed the available research on pau d'arco and found that the herb may offer anti-cancer benefits. For example, laboratory studies indicate that beta-lapachone (a compound found in pau d'arco) may help induce apoptosis: a type of programmed cell death essential for stopping the proliferation of cancer cells. Until the anti-cancer effects of pau d'arco are explored in larger studies, however, pau d'arco cannot be recommended in treatment or prevention of cancer.

2) Inflammation

Pau d'arco may also help fight inflammation, according to a study published in the Journal of Ethnopharmacology in 2008. In tests on mice, the study's authors determined that pau d'arco may suppress the production of pro-inflammatory substances known as prostaglandins.

Although the study's authors conclude that pau d'arco extract could potentially aid in the treatment of inflammation-related conditions like arthritis and atherosclerosis, it's important to note that there is currently a lack of clinical trials testing the use of pau d'arco for these conditions.

3) Fungal Infections

For a 2001 report published in the Journal of Ethnopharmacology, researchers analyzed the antifungal activity of 14 types of Paraguayan plants commonly used in traditional medicine.

Their findings revealed that — along with Paraguayan starbur, palo blanco, and corrida yerba de guava — pau d'arco had the highest activity against fungi and yeasts.

Uses for Pau D'Arco

In alternative medicine, pau d'arco extract is typically touted as a natural remedy for the following health problems:

In addition, some proponents claim that pau d'arco can prevent and treat certain types of cancer, improve digestive health, boost the immune system, and promote detox.


Due to a lack of research, little is known about the safety of long-term use of supplements containing pau d'arco. However, there's some concern that certain compounds found in pau d'arco may have toxic effects when taken at high doses. These compounds include hydroquinone, which may cause liver and kidney damage.

In addition, pau d'arco may trigger side effects like dizziness, nausea, vomiting, and diarrhea.

Since pau d'arco may also cause blood clotting, it should be avoided by people with clotting disorders and/or anyone using blood-thinning medications.

Supplements haven't been tested for safety and due to the fact that dietary supplements are largely unregulated, the content of some products may differ from what is specified on the product label. Also keep in mind that the safety of supplements in pregnant women, nursing mothers, children, and those with medical conditions or who are taking medications has not been established. You can get additional tips on using supplements here.

Where To Find It

Widely available for purchase online, dietary supplements containing pau d'arco extract can be found in many natural-foods stores and in stores specializing in dietary supplements.


Due to the limited research, it's too soon to recommend pau d'arco as a treatment for any condition. If you're considering using it, talk to your doctor to weigh the potential risks and benefits. Keep in mind that alternative medicine should not be used as a substitute for standard care. Self-treating a condition and avoiding or delaying standard care may have serious consequences.


Byeon SE, Chung JY, Lee YG, Kim BH, Kim KH, Cho JY. "In vitro and in vivo anti-inflammatory effects of taheebo, a water extract from the inner bark of Tabebuia avellanedae." J Ethnopharmacol. 2008 Sep 2;119(1):145-52.

Gómez Castellanos JR, Prieto JM, Heinrich M. "Red Lapacho (Tabebuia impetiginosa)--a global ethnopharmacological commodity?" J Ethnopharmacol. 2009 Jan 12;121(1):1-13.

Portillo A, Vila R, Freixa B, Adzet T, Cañigueral S. "Antifungal activity of Paraguayan plants used in traditional medicine." J Ethnopharmacol. 2001 Jun;76(1):93-8.

Disclaimer: The information contained on this site is intended for educational purposes only and is not a substitute for advice, diagnosis or treatment by a licensed physician. It is not meant to cover all possible precautions, drug interactions, circumstances or adverse effects. You should seek prompt medical care for any health issues and consult your doctor before using alternative medicine or making a change to your regimen.

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