L-ascorbic acid (vitamin C) oxidizes the copper(II) ion in GHK-Cu, neutralizing both actives
Glutathione (GSH) as distributed by Peptides Lab UK is not intended for, and must not be used for, human consumption, medical treatment, self-administration, veterinary applications, or any use outside of a controlled laboratory environment
Metformin, through the induction of 5' AMP-activated protein kinase and subsequently insulin sensitivity, has been widely used as a therapeutic agent in various conditions, including type 2 diabetes mellitus, PCOS and gestational diabetes (Reference Rice, Elia and Jawad42)
2014;15(348):g2366
Biochem Soc Trans 33:13751377 Huang K, Czymmek KJ, Caplan J, Sweigard JA, Donofrio NM (2011) HYR1-mediated detoxification of reactive oxygen species is required for full virulence in the rice blast fungus