This book endeavours to describe the unlimited possibilities of medicinal plants and their benefit to mankind. only 10% of the world's estimated 13 million species have been investigated, thus the medicinal plant field is open to research in the next millenium oligotherapy (therapy with oligoelements obtained from bio - organically - grown plants that have medicinal properties) play an important role as a complementary tool for various diseases, as in conventional medicine, not always are results 100% positive. However, in many cases this therapy is a cure, and in others, it provides a feeling of well being. In many patients the therapy is provided parallel to conventional drugs. Oligotherapy is a step forward for standardized future techniques.