Without adequate copper binding, youre just using an expensive amino acid chain with minimal biological activity
Concentration Ranges: In vitro fibroblast studies have typically used GHK-Cu concentrations ranging from 1 nM to 10 M, with different effects observed across this range
(aapcc.org/annual-reports, 2019)
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Regular Glutathione is not easily absorbed by the skin
Some research suggests vitamin E may support overall brain health and memory performance