Trophic (from the Greek trophikos, meaning “turning toward” or “to change”) hormones are hormones that regulate the production of other hormones by different endocrine glands. These hormones “turn on,” or activate, the target endocrine glands. The trophic hormones are thyroid-stimulating hormone (TSH), adrenocorticotropic hormone (ACTH), follicle-stimulating hormone (FSH), and luteinizing hormone (LH).