Pau darco inner bark tabebuia impetiginosa comes from the bark of trees grown in tropical regions such as argentina and brazil and has been used as a tonic for the immune system since the time of the incas natures answer capsules feature the highest quality of organic responsibly wildcrafted or cultivated herbs which maintain the naturallyoccurring constituents found in the plant they are carefully selected and finely milled micronized allowing faster absorption by the body manufacture