Light exposure also contributes to degradation, particularly for peptides containing tryptophan, tyrosine, methionine, or cysteine residues
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Properly stored (refrigerated, protected from light), GHK-Cu reconstituted with bacteriostatic water remains stable approximately 30 days
It could point to several things: A different cause: your fatigue might stem from thyroid problems, iron deficiency, or sleep apnea rather than B12
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