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GHK-Cu rarely causes redness at concentrations between 0.5 and 2 percent

[4] Growth Factor & Gene Expression Studies Investigational applications include: Early growth response gene (EGR-1) expression analysis in cell culture IGF-1/GH signaling pathway interactions in cellular models Anabolic and mitogenic response pathways in muscle and bone cell cultures Matrix metalloproteinase and angiogenic mediator expression studies Laboratory research focuses on EGR-1-mediated transcriptional control of cell growth and repair genes through matrix and angiogenic mediator pathways

no conclusions have been drawn about applicability to human muscle recovery

On the downside, vitamin B12 injections can be quite painful