Certified Organic by USDA. Nature's Answer Muira Puama Bark Once Daily Single Herb Supplement - 90 Vegetarian Capsules Nature's Answer Muira Puama Bark Once Daily Single Herb Supplement contains 500mg of high quality Muira Puama Bark. Muira Puama bark (Ptychopetalum olacoides), referred to as "potency wood", grows in Brazil, where it has been used to enhance sexual energy in both men an