copper peptide ghk-cu hair growth evidence clinical trial GHK (2016) — Research Summary The GHK-cu Masterclass | A

doi:10.1002/14651858.CD007411.pub4

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Because occludin, ZO-1, ZO-2, and claudin-5 are phosphoproteins, any changes in phosphorylation may result in altered BBB permeability [88]

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