Journal of Clinical Endocrinology & Metabolism , 89(7), 3543-3553
Twenty units on a standard U-100 insulin syringe is 0.2 mL, and because the vial is filled at 10 mg/mL, that works out to 2 mg of GHK-Cu per injection
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17.4 spines/50m, respectively
Travel adds legal, documentation, temperature, and chain-of-custody issues that are separate from shelf life