While topical serums are excellent for surface-level hydration and minor repair, GHK-Cu injections are systemic
And some of these studies in rats involved a complete transection, not just a partial tear, but a complete cut of a given ligament or tendon or nerve pathway
This is encouraging but limited - animal results do not always carry over to humans, and this is one study, not a body of evidence
doi: 10.1002/jcp.24395 242 SantoroA.CalvoJ
This small compositional difference is the sole reason the two solutions behave so differently after the vial is opened the benzyl alcohol acts as a built-in defense against bacterial contamination whenever the stopper is pierced
The latter is the first macrocyclic intermediate common to heme, chlorophyll, siroheme and B 12 itself