HCG (Human Chorionic Gonadotropin) is a hormone that mimics luteinizing hormone (LH) in the body, stimulating the testes to produce testosterone, making it especially valuable during or after anabolic steroid use to maintain fertility, prevent testicular atrophy, and support testosterone production. It can also enhance mood, libido, energy levels, and overall hormonal balance. In some protocols, HCG is also used for weight management and fat metabolism, although this application is more controversial. Its role in reproductive health and endocrine support makes it a key player in hormone optimization and post cycle therapy (PCT).