In North American herbal medicine, pau d'arco is considered to be analgesic, antioxidant, antiparasitic, antimicrobial, antifungal, antiviral, antibacterial, anti-inflammatory, and laxative, as well as to have anticancerous properties.
Scientists have identified two active chemicals in pau d'arco. These chemicals are called naphthoquinones: lapachol and beta-lapachone. In lab tests, these chemicals killed some bacteria, fungi, viruses, and parasites. They also have anti-inflammatory properties, and may be effective against diseases such as osteoarthritis. University of Maryland Med Center
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