HCG Pregnyl 5000 IU Organon is a post cycle steroid and is made by Organon. The active substance is Human Chorionic Gonadotropin. HCG is not an anabolic/androgenic steroid but a natural protein hormone which develops in the placenta of a pregnant woman. It has luteinizing characteristics since it is quite similar to the luteinizing hormone LH in the anterior pituitary gland.