Nature was the first line of treatment for humankind in the history of medicine. Nowadays, naturopaths, herbal, complementary and traditional medicine physicians work in almost all countries, and also some people organize herb stores and groceries. In the culture of Iranian people, the activity of these stores is well acknowledged, as well as herbal clinics. Also, using of natural products is growing very fast in this country. Hence, evaluation and investigation of the providers of natural medical products is valuable. The present study focuses on the more prevalent medicinal herbs which have been purchased from herbal medicine stores in Tehran, the capital of Iran, in the year 2008.