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Note that reconstituted injectable GHK-Cu can be used topically, but topical copper peptide products formulated for skin application may include additional ingredients optimizing penetration and stability that simple water reconstitution doesn't provide

The peptide you salvage after a storage violation might work, but 'might' has no place in reproducible science

Sci Rep (2019) 9(1):10010

doi: 10.1007/s00417-010-1455-1 Summary Keywords glaucoma, nutrients, diet, optic nerve, oxidative stress Citation Yang Y, Zhou H and Hong Z (2024) Glaucoma and dietary links: insights from high-salt intake, the Mediterranean diet, and specific nutrients

And how do you find out if you have a deficiency

On top of that, unregulated dosing and contamination can harm performance and health