HCG is the type of hormone found in human body and specially females during their pregnancy period. The hormone named Human Chorionic Gonadotropin is popularly called HCG and is responsible for enhanced metabolism in female body when she is carrying child. This hormone that is naturally produced in female body during this period is also artificially injected in order to enhance the fertility. The use of this hormone was earlier related to pregnancy but later in 1950s, the whole story changed when physician called ATW Simeon performed different tests on this hormone for other applications like weight loss. These tests were performed along with low calorie diet to get the substantial weight loss. The process that started in 50s got approval only in 1970s as the wrong administration of the hormone and the diet may also result into dangerous outcomes.