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Its resistance to gastric degradation relative to other peptides of similar length has been studied in rodent models

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Lyophilized (unreconstituted) GHK-Cu powder stores much longer: Frozen at -20C: 18-24 months Refrigerated at 2-8C: 12-18 months Room temperature: 2-4 months maximum If you won't use a vial within 30 days of reconstitution, consider reconstituting smaller amounts more frequently rather than mixing everything at once

Subcutaneous Drug Injection Review (PMC) Pharmacologic considerations of the subcutaneous route Related research, protocols, and guides Explore the available research context, protocol variants or comparisons, and practical guides