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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

Similarly, a study of Reddit users' self-reported side effects of retatrutide differed markedly from clinical trial data, including increased appetite, food cravings, and insomnia

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Why researchers combine them The two peptides target mechanistically distinct pathways