I don't know if it's tryly beneficial, but I have been going IM with my HGH for a couple of weeks now and feel it just the same. I just mix it with my IGF and go right into the tricep.
I would think IV would be just as good as any way to grow. I just like spot injecting. I know it has to get converted to IGF in the liver, but I'm a weirdo, what can I say.