Why is HGH illegal?

Could you elaborate on the reasons why HGH, or Human Growth Hormone, is considered illegal in many jurisdictions? Are there specific concerns regarding its safety, potential for misuse, or impact on fair competition that have led to these restrictions? Additionally, how does the legal status of HGH differ between countries, and what measures are in place to enforce these laws? Understanding these factors may help clarify the rationale behind the prohibition of HGH.