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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
Both B12 shots and IV infusions bypass the gastrointestinal tract entirely, eliminating this dose-dependent absorption loss
long-term effects on NAD+ metabolism, liver function, and cardiovascular health are unknown
Restricted adipogenesis in hypertrophic obesity: The role of WISP2, WNT, and BMP4
This is one rabbit study, not human evidence
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