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Results and Discussion Intranasal GHK-Cu peptide improved cognitive performance in transgenic 5xFAD mice This study showed that transgenic 5xFAD mice of both sexes exhibited improved cognitive performance after 8 weeks of intranasal GHK-Cu treatment, compared to intranasal saline treated transgenic mice

They come back the following week saying they do not feel much difference

That last clause is the one that distinguishes a prescription peptide from a supplement

Yang, A.-M

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