What the Evidence Actually Shows Here is the honest evidence status, component by component: GHK-Cu has the deepest literature of the three
The angle depends on available tissuewith more tissue, you can inject more steeply (90 degrees), with less tissue, more shallowly (45 degrees)
Add each solvent one by one: PBS Solubility: 50 mg/mL (99.13 mM)
Copper peptide, or GHK-Cu, sits slightly apart because it is best known for skin and connective tissue support, and you can explore how GHK-Cu is used within a supervised protocol for connective tissue and skin recovery, including why sourcing and provider oversight still apply if that is your interest
The peptide complex is thought to possibly inhibit NF-B activation by affecting the phosphorylation of IB, a protein that inhibits NF-B