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This is normal for a compound at this stage, and it is still a limitation
A practical default is about 28 days in the refrigerator at 2-8 C when mixed with bacteriostatic water and handled cleanly
Funky Monkey Stuck in a funk
Anecdotal reports from long-term users in research communities suggest the peptide remains well-tolerated over extended periods
GHK-Cu is one of the best-known copper peptides, but some formulas use other copper complexes or blends with different feel and stability, so the label matters
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