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09 /GHK-Cu vs tretinoin: is prescription strength different
Any benefits described on Celia-rx.com are based on third-party research and published studies
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For researchers, the relevant cautions are (a) most of this work comes from a small number of laboratories with overlapping authorship across decades, and (b) the in vitro concentrations at which effects are reported (sub-nanomolar to nanomolar) are within the plasma-concentration range claimed for endogenous GHK, but human plasma concentrations themselves rest on a thin measurement base
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