Titanium dioxide is often used as a pigment in “natural” vitamins and supplements. An untested nanoparticle powder made from titanium bits, titanium dioxide has been linked to autoimmune disorders and cancer. Titanium dioxide serves no therapeutic purpose whatsoever, and does not belong in a health supplement.

“Titanium dioxide has recently been classified by the International Agency for Research on Cancer (IARC) as an IARC Group 2B carcinogen ‘possibly carcinogen[ic] to humans,'” explains the Canadian Centre for Occupational Health and Safety on its website. “Evidence showed that high concentrations of pigment-grade (powdered) and ultrafine titanium dioxide dust caused respiratory tract cancer in rats exposed by inhalation and intratracheal instillation.”

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