Traces of manganese found in household water could be sufficient to cause permanent brain damage to those who take a regular shower, according to a report published in the US journal Medical Hypotheses.
John Spangler of the Wake Forest University School of Medicine in North Carolina and his team suggested that breathing in vapour containing manganese salts could be dangerous over the longer term.
"Inhaling manganese, rather than eating or drinking it, is far more efficient at delivering manganese to the brain. The nerve cells involved in smell are a direct pathway for toxins to enter the brain," Spangler wrote.
I wonder if, by any chance, the research was sponsored by deoderant companies?