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What is HCG Human chorionic gonadotropin (HCG) is a naturally occurring peptide hormone that functions similarly to luteinizing hormone (LH). It plays a central role in reproductive health, regulating testosterone synthesis in men and ovulation in women. In sports and hormone therapy, it is often used to maintain testicular activity during testosterone replacement or after anabolic cycles. Modern HCG is produced biosynthetically, ensuring consistent purity and biological activity. Main effe..