Stevia plant is easily contaminated during growth, development and processing, and for this, an extensive research is needed to explore the characteristics of the heavy metal produced by a plant of Stevia. The heavy metals produced from the herb and its toxicity of Stevia plant is not well documented and scientific evidence is limited to establishing Stevia plant as a medicinal plant. Although there is a great concern about heavy metal contamination of herbal raw materials, information from the World Health Organization regarding permissible limit is available only for Pb and Cd. Heavy metal accumulation of the Stevia rebaudiana extract is dependent on an obtained heavy metals from the soil and water. Heavy metals from plant sources may be also vary from place to place because soil heavy metals content varies geographically, thus, they have become the
subject of many research projects.