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Compound-Level Evidence GHK-Cu A 2018 review in the International Journal of Molecular Sciences synthesized gene-expression data showing GHK-Cu modulates over 4,000 human genes (Pickart and Margolina)
The facts do not support that
There are no documented human side effects because it has not been tested in people
If you are managing a real injury or a real recovery goal, that is the version of this protocol worth having
They stress its an extra layer of defense (not a replacement for topical sunscreen) Updated: Jul
GHK-Cu is in a distinct functional category
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