Human Chorionic Gonadotropin (HCG) is a glycoprotein hormone composed of alpha and beta subunits that signals through the luteinizing hormone/choriogonadotropin receptor (LHCGR), a G protein-coupled receptor. It shares structural homology with luteinizing hormone (LH) and is studied for its role in gonadal steroidogenesis and reproductive signaling. Principal research areas include reproductive endocrinology, pregnancy-related physiology, and gonadal function models. Supplied as a lyophilized research material for laboratory research applications.