Human Chorionic Gonadotropin (HCG) is a hormone that is used to stimulate the production of testosterone in the testes. Also known as the pregnancy hormone, HCG is an effective way to help boost natural testosterone levels after a steroid cycle. It is completely safe for men to take and does not produce oestrogen in the body. In fact, it has the opposite effect and is often prescribed by doctors to men with hypogonadism, low testosterone levels and infertility. HCG works by stimulating the Leydig cells, which are responsible for the production of testosterone in the testes; it is clinically used to maintain and restore testicular size and normal test production. Unlike other testosterone-boosting methods, HCG does not shrink the testes.

It is often used during and after steroid cycles to maintain and restore testicular size as well as normal Testosterone production. HCG is also often prescribed to women with infertility issues, as the Hormone significantly helps increase ovulation, and treat infertility issues by stimulating the production of eggs from the ovaries, which increases the likelihood of getting pregnant.