I heard some controversies over it.
If you are deficient of hgh then for sure you can inject it because you have diseases.
But if you are not, then there are some controversies over it. Someone said as long as you are short, or you consider yourself short and you have the enough money, you can inject hgh as you want. Someone said only you are under -2SD of the average height, you can inject otherwise just forget about it.(It seems because of the long-term potiental side effects, like Diabetes II) Someone said if you are not deficient you can't, because it won't work.
I ask this question on this forum to avoid the infiltrations of business.