I believe you're thinking of Nutropin Depot. Genentech makes it, there's also a UG lab making it. It's intention is to be injected every 30 days. Depending on which kit you get it will release between 2.2 and 1.8 IU's of HGH ED. The parent compound is the same as any other HGH, just he delivery system is different.
That's how it's supposed to be used. BBer's are of course going to play around and do a varity of different things.
It's sort of the Sustenon of HGH.