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how much ghk cu to take per day GHK-Cu Dosage: A Doctor's Guide Calculations, Mixing & Safety GHK-Cu peptide guide. : r/NTNPerformance
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Verdict: Limited evidence the absence of human trials reflects a combination of a cancelled unpublished safety study, specific FDA-documented safety concerns, and structural barriers that make large-scale human trials difficult to initiate and fund [4][10][1415]

Reactions don't improve with continued use

Semenchenko et al

We also love that it includes methylated B12 in the form of methylcobalamin, which is identical to the natural B12 variant found in food
