Gonadorelin is a peptide that is similar to gonadotropin-releasing hormone (GnRH). GnRH is naturally made and released from the hypothalamus while gonadorelin is an injection that has been tested in cattle and rats. Gonadorelin has been shown to play a large role in the regulation of the reproductive system through the hypothalamus-pituitary gonadal (HPG) axis. When gonadorelin is administered it leads to the release of luteinizing hormone (LH) and follicle-stimulating hormone, which in turn, regulate the reproductive system in both males and females.