However, that does not mean you should not, at the very least, not with the permission or direction of a physician or other health professional
Across hundreds of animal studies, serious adverse effects have not been commonly reported
Experimental obstructive cholestasis: the wound-like inflammatory liver response
If you are looking for a GHK-Cu product formulated with barrier compatibility in mind, Blue Balm by HealthyDerm pairs copper peptides with a grass-fed tallow base that mirrors your skin's own lipid profile, designed to deliver the benefits of copper peptide deep into the dermis while keeping the surface calm
Subcutaneous injection and oral use depend on their goals
Where a dose sits outside standard ranges (GHK-Cu at 20mg/day in the Benjamin Button Stack is 4x the typical aggressive tier), he still publishes it