ghk-cu 50 mg dosage 50MG | Research Peptide Ghk Protocol Peptide Dosage Chart
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Do not assess results before 6 weeks
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Cosmeceuticals: peptides, proteins, and growth factors

25-29 gauge needle 1/2- 1 length for Subcutaneous Injection depending upon angle of injection and whether you pinch or dont pinch the skin at the injection point
"AOD9604 - Important Clarifications" (PDF)

There is also the practical burden