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This strategy outperformed Plaza-Diaz et al.s fecal microbiota transplantation (FMT) protocol, which normalized Firmicutes/Bacteroidota ratios but required repeated invasive procedures and conferred no neural repair [47]

Ambrosio, M

They are not recognized as generally regarded as safe (GRAS) substances for dietary supplement use

Some users run 8-12 week injectable courses and bridge with oral precursors (NAC or liposomal glutathione) during off periods, though this appears to be a cost management strategy rather than a physiological requirement

Application and Formulation Considerations for Research When exploring GHK-Cu for scar reduction in a research context, formulation and purity are paramount