Using HGH for weight loss, muscle building, or anti-aging is experimental and controversial. HGH injections are believed to decrease fat storage and increase muscle growth to some extent, but studies have not shown this to be a safe or effective weight loss remedy.
HGH seems to be in vogue these days but I have never read about it being used as you described so I will have to do some educational reading to get up to speed on this topic.
I wish you the best with the injections and do let us know how it is going for you. I am glad to see you have done your own research and also talked with someone who has had the treatment.