HCG injection (Lyophilized) (Pregnyl®) is a medication that may assist with fertility treatments. It contains human chorionic gonadotropin (HCG), a hormone produced during pregnancy. Luteinizing hormone (LH), also produced by the body, supports egg development and stimulates ovulation before pregnancy. HCG has similar actions to LH, and when used for infertility, it mimics the LH surge to help stimulate ovulation. In women, HCG injections may be used to trigger ovulation and assist with infertil