Deca, Primo, EQ, and Anavar are all good to help with healing of a damaged tendon. They all increase several biomakers of collagen syn (type III, II, I, procollagen markers).
HGH showed the most increase of collegen synthesis and is dose dependent. The more HGH you use, the more collegen synthesis you will have
HGH is by far the best, just like Overload stated with his comment and his experience