hCG 10000IU is a 10,000 IU format of human chorionic gonadotropin, a heterodimeric glycoprotein hormone composed of alpha and beta subunits. Researchers use hCG in laboratory work as a reference hormone for LH receptor signaling and reproductive endocrinology assays. Studies have also examined hCG in the context of steroidogenesis pathways and gonadal cell models.