Nature s Herbs Wild Countryside pau d Arco is harvested from its natural, wild environment in the high mountain regions of South America. Our exclusive FreshCare System inhibits normal plant oxidation, maintaining product potency and extending freshness. It includes all-natural antioxidants in each capsule, oxygen-absorbing packets in each bottle, special airtight seal and amber glass packaging for uncompromised quality. Nature s Herbs unconditionally guarantees this completely natural product to your satisfaction. Nature s Herbs products are non-irradiated.