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A 1993 paper describes an experiment in which rats were implanted with wound chamber models that were subsequently treated with either GHK-Cu or a saline placebo

Topical results are real, but they follow biological timelines, not social media timelines

They measured subjective sleep quality more than objective sleep quality They subjectively estimated tiredness Sleep structure was not fully characterized by polysomnography in all studies Data analysis suggested some observed changes were due to issues with the placebo group What is promising about these findings is that statistically significant effects were found in such small sample sizes

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