This article provides detailed information on the morpho-physiological characteristics, chemical composition, especially the amount of flavonoids and their function in the body and their role in human health, as one of the medicinal plants Hypericum Perforatum L.At the beginning of the article we will discuss in detail the role and distribution of the plant Hypericum Perforatum L. in modern taxonomy. The article describes the properties of rutin flavonoid, one of the most common flavonoids in this plant, and its biochemical functions in plants and humans.