Bisphenol A and two other chemicals have been linked to infertility in several recent studies, reports Environmental Health News, adding new environmental concerns to couples trying to conceive.
Researchers looked at the chemicals’ effect on the success of  in vitro fertilization, or IVF, in which an egg is removed from a  woman’s uterus, grown to an embryo in a petri dish, then implanted back  into the uterus.
In one study, Lindsey Konkel reports, women with higher  concentrations of bisphenol A, or BPA, had lower peak levels of  estradiol, a form of estrogen that helps eggs develop. In another,  researchers found a link between blood concentrations of polychlorinated  biphenyls (PCBs) and the rate at which embryos attached to the uterine  wall. Finally, in a third study, women with the highest  hexachlorobenzene (HCB) levels in their blood were more likely to  experience a failed embryo implantation than those with the lowest  levels.
The interesting, and rather alarming, thing here is that two of  the chemicals have been banned in the United States for years. HCB, a  pesticide, has been banned here since1984, though it is still used in  some other countries and may be created as an impurity in the making of  other pesticides and chemicals. PCBs, a class of industrial fluids used  mostly in electrical equipment, have been banned since 1979, but their  persistence in the environment means they still show up in the blood of  more than 95 percent of Americans older than 12.
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Bisphenol A and two other chemicals have been linked to infertility in several recent studies, reports Environmental Health News, adding new environmental concerns to couples trying to conceive.

Researchers looked at the chemicals’ effect on the success of in vitro fertilization, or IVF, in which an egg is removed from a woman’s uterus, grown to an embryo in a petri dish, then implanted back into the uterus.

In one study, Lindsey Konkel reports, women with higher concentrations of bisphenol A, or BPA, had lower peak levels of estradiol, a form of estrogen that helps eggs develop. In another, researchers found a link between blood concentrations of polychlorinated biphenyls (PCBs) and the rate at which embryos attached to the uterine wall. Finally, in a third study, women with the highest hexachlorobenzene (HCB) levels in their blood were more likely to experience a failed embryo implantation than those with the lowest levels.

The interesting, and rather alarming, thing here is that two of the chemicals have been banned in the United States for years. HCB, a pesticide, has been banned here since1984, though it is still used in some other countries and may be created as an impurity in the making of other pesticides and chemicals. PCBs, a class of industrial fluids used mostly in electrical equipment, have been banned since 1979, but their persistence in the environment means they still show up in the blood of more than 95 percent of Americans older than 12.

Keep reading …