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It stands apart from older GHRPs for selectivity: in human studies it raised GH without meaningfully elevating cortisol or prolactin
With gastrointestinal impairment, consuming B12-fortified foods and/or supplements may be ideal
The trade-off
Research has shown GHK-Cu influences expression of over 4,000 human genes, stimulates collagen I, III and elastin synthesis, activates matrix metalloproteinases for extracellular matrix remodelling, supports angiogenesis through VEGF and FGF upregulation, and suppresses pro-inflammatory TNF- signalling
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