It can't change your genetic height because it does nothing to your genes.
And, it is very costly, 99% of people can't afford for it.
And it has potiential fatal risks like Diabetes, etc.
But if you are diagnosed with HGH deficiency, and other non-genetic serious problems that make you short, HGH will be prescribed for you, but responsible doctors will not prescribe to you if you are not under -2SD of average height if it is not HGH deficiency.(Even if you are they will also probably not prescribe to you. I know a case)