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doi: 10.1038/s41580-020-00324-8 20 LiuYWanYJiangYZhangLChengW

Community discussions indicate some researchers prefer AHK-Cu for hair growth applications while using GHK-Cu for broader regenerative purposes

Scientific Classification A small-molecule quinolinium derivative and selective nicotinamide N-methyltransferase (NNMT) inhibitor

European Journal of Clinical Pharmacology, [online] 43(6), pp.667669

That's over three months of daily administration

On legal status, you must know that all peptide companies supply for research use only, and these research-use peptides skip the strict safety review that prescription drugs pass