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In mammalian hair follicle organ culture studies, GHK-Cu administration increases the anagen phase duration by 22% while simultaneously increasing hair shaft diameter by 12%

The major limitations of these studies included: small sample size, cohort consisting of healthy volunteers, extremely short study period with an even shorter follow-up, and lack of measurement of blood levels of glutathione [1012]

For hair, that means a structured hair quality and restoration program with exosomes or PRP

In neuro-research, GHK-Cu has been reported to boost the expression of BDNF and VEGF, showing neuroprotective properties in models of oxidative stress and excitotoxicity