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Toxicol Appl Pharmacol 204:329342 Sun X, Shih AY, Johannssen HC, Erb H, Li P, Murphy TH (2006) Two-photon imaging of glutathione levels in intact brain indicates enhanced redox buffering in developing neurons and cells at the cerebrospinal fluid and blood-brain interface

1A and Table EV1

If you were to puncture a vial of sterile water with a needle, it's no longer sterile

4.3 GHK-Cus Possible Mechanism of Action 4.3 GHK-Cus Possible Mechanism of Action Despite decades of research, there is still a lack of unanimous agreement among researchers as to what allows GHK to produce so many diverse and positive biological effects

Its effect is eat less and spend a bit more. This is why the two are natural complements rather than substitutes