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The main concern is that persistent nausea, vomiting, or diarrhea may cause dehydration and reduced kidney perfusion
Foundational GHK-Cu (sister peptide) paper: stimulates collagen synthesis in human fibroblasts, effect beginning at 10^-12 to 10^-11 M and maximal at 10^-9 M the same potency window later reported for AHK-Cu, establishing the copper-tripeptide mechanism
This is one rabbit study, not human evidence
Treatment schedules vary by how many treatments you have needed previously
Only for the growth-hormone-deficiency pattern (poor sleep + low recovery)
long-term effects on NAD+ metabolism, liver function, and cardiovascular health are unknown
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