Human Chorionic Gonadotropin Injection 10,000 I.U./vial (5)Human Chorionic Gonadotropin (hCG) is used to mimic luteinizing hormone (LH) to induce ovulation, treat ovarian cysts, and stimulate testosterone production in male animals. It is a crucial component in controlled breeding programs, especially for mares, and can also be used in diagnostic tests for cryptorchidism (undescended testes) and to manage chronic egg-laying in birds.