Copper is a required cofactor for lysyl oxidase (connective-tissue crosslinking), for superoxide dismutase (antioxidant defense), and for enzymes that support angiogenesis, so a molecule that delivers copper in a controlled, cell-usable form has a coherent reason to influence tissue remodeling and vascular biology
Dec 2016;104(6):1523-1533
You often wont need more than a pinch in your recipes
Theoretical concerns include: GHK-Cu angiogenic properties potentially conflicting with calcineurin inhibitor mechanisms
Signs You May Want to Pause or Stop If you notice headaches, irritability, trouble sleeping, or nausea after taking this, you're taking too much or too often
This makes glutathione one of the more powerful supplements available to help fight the signs of aging