Does exposure to environmental toxicants inhibit our ability to have healthy children who develop normally? Biologic markers—indicators that can tell us when environmental factors have caused a change at the cellular or biochemical level that might affect reproductive ability—are a promising tool for research aimed at answering that important question. Biologic Markers in Reproductive Toxicology examines the potential of these markers in environmental health studies; clarifies definitions, underlying concepts, and possible applications; and shows the benefits to be gained from their use in reproductive and neurodevelopmental research.