Ideally it would be nice to have a product that is free of asbestos. In my opinion, our goal should be NO dioxin in tampons. I am not aware of any scientific study that measures and compares dioxin levels of different tampon brands. Testing of all tampons for dioxin should be done. Some dioxins may be present for reasons other than from the bleaching process, e.g., from pesticides or fertilizers, etc.
Nothing beats actual testing.
Similar information had already appeared in feminist publications. There are several other good sites dealing with the safety of tampons and other products, for example, S.P.O.T. and Terrafemme . See also links . And see also the pages on the Rely tampon , involved in toxic shock about 1980. Read a poem by a woman who had toxic shock from tampons.