HCG 5000 refers to your dosage strength (5000 IU) of Human Chorionic Gonadotropin (HCG), a hormone made during pregnancy. In clinical and Conditioning contexts, it is used for several uses: What is HCG? Human Chorionic Gonadotropin (HCG) is actually a hormone Normally made by the placenta during pregnancy. It performs a task in retaining the crea