I would suggest that you need to read all of the studies before you reach a conclusion
doi:10.1897/04-236R.1 Liu B, Liu X (2004) Direct photolysis of estrogens in aqueous solutions
Remarkably, injectable GHK-Cu in one body area (thigh muscles) improved healing at distant locations (ears), demonstrating systemic enhancement that strongly increased collagen production, angiogenesis, and wound closure throughout the body
I find the chronic injury situation illustrates an important principle: peptides accelerate natural healing but cannot force tissue to repair that has fundamentally changed over years of dysfunction
J Physiol Pharmacol 1(67):709715 Ugar M, Tufan AN, Altun M, Guclu K, Ozyurek M (2018) Glutathione peroxidase activity of biological samples using a novel microplate-based method
HCG can be added to the protocol to maintain testicular size and function if desired