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Copper toxicity concerns exist with prolonged GHK-Cu use, though clinical cases remain extremely rare at therapeutic doses
the ependyma within the ventricles, the pia-glia limitans at the brain surface, and the leptomeningeal cells forming the interface between the CSF and the perivascular fluid of subarachnoid blood vessels
Cellular Defense Peptides increase the function of native antioxidant enzymes like superoxide dismutase (SOD), catalase, and glutathione peroxidase by inducing expression or boosting enzyme stability
B12 deficiency can still occur and this vitamin may still be needed
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