Pau DArco comes from the inner bark of Tabebuia trees, which thrive in the Amazon rainforest. It has been used for centuries by traditional herbalists for dozens of treatments, mainly to improve the bodys defense mechanisms. Swanson Full Spectrum® Pau dArco capsules provide 500mg of pure pau darco inner bark, which: Helps support healthy intestinal flora, Traditional plant for improving the immune system. Dosage: Take two capsules, once or twice daily with a meal and a sufficient amount of water.