RE: will deca help with an RC injury?
I will say no, it will not help heal your RC injury, it will make your shoulder feel better though.
I had RC repair surgery in December. I did quite a bit of research and used 100mg every other month directly into that shoulder to assist with keeping the repaired tendon soft and pliable and used 4iu HGH 7x a week. It did recover nicely. I would do this again if I had to have it ever repaired again.