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As mentioned above, another central player in these redox systems is thioredoxin, which is reduced by NADPH to induce the transfer of electrons for use in DNA synthesis, signal transduction and redox regulation

If B12 is given without adequate folate, the methylation cycle can become inefficient

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10.1038/jcbfm.1991.127 J

Unreconstituted lyophilised GHK-Cu powder remains stable at 20C for 1224 months, but once mixed into serum or cream base, refrigeration becomes mandatory to prevent peptide degradation, copper ion dissociation, and loss of collagen-stimulating activity