This from snopes.com, on the issue of toxicity in tampons, for a paper I'm writing:

"The Environmental Protection Agency monitored the level of dioxins in tampons in the late '80s and again in 1994. In both instances, the amounts present were barely detectable. Is it still too much, though? A number of researchers say even small amounts of dioxins are unacceptable in any product.

Though moving to all-cotton unbleached tampons will eliminate any possibility of contact with dioxins from that source, there's danger from another direction: conventionally-grown cotton is one of the most pesticide-intensive crops in commercial agriculture. About 10% of the world's pesticides and 22.5% of all insecticides are used on cotton. According to the Sustainable Cotton Project in California, nearly one-third of a pound of chemicals is used to make just one cotton T-shirt. Don't even try to imagine how much of it ends up on a tampon. "


Hence, these are my friends and from the sound of that, organic cotton t-shirts should be my friend too!!