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Copper-containing GHK-Cu is sensitive to oxidation, so inspect for cloudiness or discoloration and discard compromised solution
Contamination at this stage can introduce bacteria that the benzyl alcohol alone may not fully control, especially with repeated access over weeks
Store unopened vials in a cool, dry place
What actually differentiates brands Since the formula is fixed by USP specification, the meaningful differences between bacteriostatic water sources fall into five categories that are independent of the product chemistry
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