For some reason he gets upset and defensive when you ask him to extrapolate on this subject.
From what I've been able to gather of knowledge, from endocronologists at other BB forums, daily doses of 3-6 iu HGH has been shown effective in aiding soft tissue repair, due to collagen synthesis, proliferation, IGF 1 etc.
It's definitely no miracle tho, but in conjunction with a solid physio rehab plan, massage, bpc 157 and so forth, it does help.
Here's a good place to start:
AMA 3.0 Turbo-Charged ft El Chapo