The Gary Null Blog

ScienceDaily (Feb. 26, 2011) — According to a new study published February 24 in the peer-reviewed journal Environmental Health Perspectives (EHP), serum polychlorinated biphenyls (PCBs) at concentrations found in the general U.S. population are associated with the failure of fertilized embryos to implant in the uterus after in vitro fertilization (IVF). This study may help explain earlier reports of impaired reproduction and increased time to pregnancy among women exposed to PCBs. "Our findings provide insight into a specific time point following conception that determines whether a pregnancy will occur that may be particularly sensitive to PCB exposure," says lead author John Meeker.