Tampons are used by the majority of menstruating women. An inaugural study published in Environment International measured the concentration of 16 metals and metalloids (elements that have characteristics of both metals and nonmetals) in 30 tampons from 14 brands and 18 product lines. The researchers detected all 16 metals in at least one sampled tampon, including elevated concentrations of toxic metals such as lead, cadmium and arsenic. Non-organic tampons were higher in lead concentrations, and organic tampons were higher in arsenic. The metals may come from agricultural or manufacturing processes. Additional research is needed to determine whether and to what extent the vagina’s highly absorptive tissue assimilates these metals.