Pau D"Arco bark comes from a tree that grows primarily in Argentina and Brazil. The tree is known as taheebo. Unlike other trees in its midst, pau d"arco does not develop fungus growth. It contains a chemical called lapachol, which may account for the herb"s traditional use in strengthening and supporting the immune system. Pau d arco also has been used traditionally to maintain a healthy circulatory system. NSP"s pau d"arco comes from Brazil. Each capsule contains 500 mg pau d"arco. Take 2 capsules with a meal three times daily.