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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.
I often get comments about tea tree oil being toxic to dogs. Tea tree oil has phenolic compounds that can be hard for a dogâs body to process, but only in high doses. The oral toxic dose of phenol in dogs is about 0.22 grams per pound of body weight. 0.22 grams is about 4 drops of tea tree oil.ea tree oil has phenolic compounds that can be hard for a dogâs body to process, but only in high doses. The oral toxic dose of phenol in dogs is about 0.22 grams per pound of body weight. 0.22 grams is about 4 drops of tea tree oil.