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Glutathione is much more resistant to air oxidation and much less toxic, and it can occur safely at 10 to 100 times greater levels

Kong, W

The same body of research also found that higher doses of GHK-Cu can produce skin irritation, and that copper in general is highly toxic, which is why formulation and concentration matter considerably in any experimental design involving this compound

Biologics for chronic inflammatory skin diseases: An update for the clinician

This is why it can be helpful to first inject a small amount of air into the bacteriostatic water vial to equalize pressure before drawing the liquid