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Using it for a multi-dose vial is asking for bacterial growth in a protein-rich solution
What to do if something goes wrong You added the wrong amount of water If you added too much water, your solution is more dilute than planned
Heat accelerates all degradation pathways, but with GHK-Cu it also increases the rate of copper-catalyzed oxidation
This documents the HPLC-verified purity for the batch you receive
Sometimes you need higher doses despite adequate numbers because functional improvement requires B12 levels well above the bare minimum for preventing deficiency
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