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To be clear up front: Koi Peptides sells research-grade, sterile lyophilized GHK-Cu powder for in vitro laboratory study only
Certain people are at greater risk for deficiency because of things like diet, lifestyle, and prescription medications
The literature supports GHK-Cu here strongly: Leyden et al
Sleep quality, stress management, and hormonal health also impact metabolic responsiveness to the peptide
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