Talcum powder
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Talc is a mineral composed of hydrated magnesium silicate with the chemical formula H2Mg3(SiO3)4 or Mg3Si4O10(OH)2.
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Safety 
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Several studies have established preliminary links between talc and pulmonary issues,[1] lung cancer,[2][3] skin cancer and ovarian cancer.[4] This is a major concern considering talc's widespread commercial and household use. However, no conclusive study has yet been made to determine either the toxicity and/or carcinogenic nature of talc and the long history of safe use suggests that these concerns are unfounded.
The U.S. Food and Drug Administration (FDA) considers non-asbestiform talc, that is talc which does not contain potentially carcinogenic asbestiform amphibole fibers, to be Generally Recognized As Safe (GRAS) for use in cosmetics.
