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The 2010 Broad Institute Connectivity Map analysis the origin of the widely-cited "31.2% gene modulation" figure showed that GHK-Cu shifts the expression of roughly 31% of human genes in the direction of a younger cellular phenotype in cultured fibroblasts

Results can vary, but some people notice changes within hours, with effects lasting anywhere from 1 to 4 weeks,s depending on the injection and individual factors

As you can see, that initial breakthrough is just the beginning

Curr Biol CB 28(4):R170-R85 McMahon J, Huang X, Yang J et al (2012) Impaired autophagy in neurons after disinhibition of mammalian target of rapamycin and its contribution to epileptogenesis [J]