Recently, there has been an upsurge of interest in the use of substances of natural origin especially herbs of plants
for therapeutic purposes such as the plant of Stevia which has been used as an herbal sweetener for years. However,
the environmental conditions of the region and the agricultural practices decide about the level of heavy metals that
could accumulate in the plant of Stevia used as herbal raw materials and also often used as food, functional food,
nutritional or dietary supplements.