National Toxicology Program

Endocrine disruptors are naturally occurring or man-made substances that may mimic or interfere with natural hormones in the body. Endocrine disruptors may turn on, shut off, or modify signals that hormones carry and thus affect the normal functions of tissues and organs. The NTP is involved in several efforts to strengthen the science base within this field.

For contact information, visit the Toxicology Branch.