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Your GHK-Cu storage strategy should freeze powder immediately upon receipt for long-term preservation, reconstitute only quantities usable within 30 days, refrigerate all liquid forms constantly at 2-8C, protect from light exposure, label with dates clearly, and discard any solution showing cloudiness, particles, color change, or past 30-day expiration regardless of appearance

These are usually mild and often resolve as your body becomes accustomed to the supplement

This is why research material is commonly prepared and characterized specifically as the copper-bound complex rather than the bare peptide

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PMID 18391970

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