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No formal clinical studies have evaluated this combination, and all stacking protocols derive from anecdotal research reports rather than controlled trials
GHK-Cu is a naturally occurring copper-binding tripeptide that forms a stable square-planar complex with Cu through coordination with histidine, glycine, and lysine residues (Pickart, Vasquez-Soltero, and Margolina 2012)
Rev Assoc Med Bras (1992) 2011;57:46-9
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However, other research leads us to think that the methylcobalamin form is excreted less frequently than the cyanocobalamin form, which suggests that it is retained in the bodys tissues better
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