Not only is HGH regulated, it even is specifically addressed under law (in the US) that lead some to believe that even prescribing it off-label it is illegal. See:

https://en.wikipedia.org/wiki/HGH_controversies#Law

No, as it requires strong medical supervision. Greg Fahy’s company is running experiments on humans approved by the FDA in his company in Los Angeles.

Not in the U.S.