Tesamorelin is a synthetic analog of growth hormone–releasing hormone (GHRH) that is commonly studied for its interaction with the hypothalamic–pituitary–somatotropic (HPS) axis, a key regulatory system responsible for controlling growth hormone secretion and metabolic balance. In research settings, Tesamorelin is used to examine how targeted stimulation of the pituitary gland influences pulsatile growth hormone release and downstream signaling pathways involving insulin-like growth factor-1 (IGF-1).