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Read tampon packaging for even a moment and you¡¯ll see words like ¡®clean,¡¯ ¡®comfort,¡¯ and ¡®protection.¡¯

But recently, tampons have been making headlines ¡ª and raising eyebrows ¡ª after a study found they contain heavy metals.

Small amounts of some toxic and heavy metals are ¡°necessary to support life. However, in larger amounts, they become toxic,¡± the Occupational Safety and Health Administration writes. Other heavy metals...