BMJ Open 10 (8), e033687
The 2025 IV pilot measured cardiac, hepatic, renal, thyroid, and glucose biomarkers and reported no abnormalities (Lee et al., 2025), which gives a sense of what those investigators considered worth checking
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GHK-Cu is a naturally occurring copper peptide famous in skin and repair research for stimulating collagen, firming and renewing skin, and supporting wound healing
Was it topical, injected, or part of a stack
Similar storage considerations apply to newer compounds like retatrutide and cagrilintide