Pau d'Arco: Ancient Rainforest Remedy with Modern Health Potential

Pau d'arco (Handroanthus impetiginosus), also called taheebo or lapacho, is a towering evergreen native to Central and South American rainforests. Its Portuguese name means "bow stick," reflecting its traditional use for making hunting bows. The inner bark has been used for millennia by indigenous peoples, including the Incas, as a health tonic.

Key Active Compounds

Two naphthoquinones—lapachol and beta-lapachone—drive most of pau d'arco's therapeutic effects.

Health Benefits

Cancer Research (Complex)

Lab studies show lapachol fights metastasis, but high doses needed for anti-cancer effect cause dangerous blood-thinning. Beta-lapachone impairs cancer cell DNA repair in vitro, but human studies are lacking. Research on lapachol was halted due to bleeding risks.

Anti-Inflammatory & Pain Relief

Both compounds suppress prostaglandin production (inflammatory mediators). A 2008 mouse study in Journal of Ethnopharmacology supports this. Lapachol also has analgesic effects; used in South American clinics for cancer pain.

Antifungal Action

Effective against candidiasis and yeast infections; lapachol is commonly used for this purpose. A 2001 study confirmed antifungal properties.

Digestive & Immune Support

Laxative properties promote regular bowel movements and colon health. Lapachol activates lymphocytes and granulocytes, enhancing pathogen defense.

Antioxidant Protection

Contains selenium and other antioxidants that neutralize free radicals, potentially slowing aging and reducing disease risk.

Other Traditional Uses

STDs (gonorrhea, syphilis), bladder/prostate infections, gastritis, liver ailments, joint pain, hernia, ringworm, viral respiratory infections, flu, infectious diarrhea. Note: Clinical validation for these is limited.

Side Effects & Safety

• High doses: nausea, vomiting, diarrhea, dizziness.
• Hydroquinone content: potential liver/kidney damage at high doses; avoid in children.
• Pregnancy/breastfeeding: safety not established; avoid.
• Bleeding disorders: delays clotting; consult provider.
• Surgery: stop 2+ weeks before/after due to bleeding risk.
• Drug interactions: increases bleeding risk with anticoagulants/antiplatelet drugs.

Critical Buying Alert

Pau d'arco is listed as endangered in Brazil (2012). Many products substitute bark from related species like Tecoma curialis. Purchase only from reputable brands to ensure authenticity and avoid contaminants.

Disclaimer: Educational only. Consult a healthcare practitioner before using herbal medicines.