A reproductive toxin is a substance or agent that can cause adverse effects on the reproductive system. The toxic effects may include alterations to the reproductive [sexual] organs and/or the endocrine system (which includes the thyroid and adrenal glands). These effects can occur in both men and women. OSHA defines reproductive toxins as "Chemicals which affect the reproductive capabilities including chromosomal damage (mutations) and effects on fetuses (teratogenesis)." Exposure to reproductive toxins may cause one to become infertile or to have difficulty conceiving a child. Reproductive toxins may affect the parent, developing child (even after birth), or both.