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Reconstituted peptides generally have a shorter shelf life than their lyophilized counterparts because water can accelerate chemical degradation and increase the risk of contamination

This is one reason why GHK-CU is frequently discussed in anti-aging and longevity-related research

The peptide is available exclusively through 503A compounding pharmacies, where it is prescribed on an individual-patient basis without the pharmacokinetic characterization required of NDA-track drugs [8]

It is not available on general retail marketplaces

Easy measuring: At 16.67 mg/mL, 1 U-100 unit = 0.01 mL = approximately 166.7 mcg