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Cinnabar (mercury sulphide - HgS) is the single most toxic mineral to handle on earth. It is the worldâs main source of mercury and has been mined since Neolithic times. However, when oxidized, this element will produce methyl mercury and dimethyl mercury, two toxic compounds that cause irreparable harm to the nervous systems of children. It is deadly in small concentrations and can be absorbed through the respiratory tract, intestines, or skin.
Rhubarb leaves contain a lot of oxalic acid, which can be deadly if taken in large enough doses. Because of their small size, children are at highest risk for oxalic poisoning after eating rhubarb leaves. Pregnancy and breast-feeding: Rhubarb is POSSIBLY UNSAFE when used in amounts greater than those found in foods.