Internal parasites are a serious public health threat. The World Health Organization estimates that 1.3 billion people carry internal parasites. The human parasite problem infects millions of people, many from progressive countries such as Western Europe, the United States, New Zealand, and Australia.Dermisil for Internal Parasites is made from 100% natural plant extracts. We travel the world in search of only certified plant extracts that are pesticide-free and are United States Pharmaceutical grade.