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Yes, studies show GHK-Cu is well-tolerated and non-toxic at cosmetic concentrations
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Ions such as Na + , Cl , K + , and H + and metals such as Fe 2+ are transported by channels, symporters, and antiporters such as Na + /H + antiporter NHE1 and the Cl channel CFTR [14]
Long-term usage of large doses of glutathione may pose health hazards, such as kidney and liver damage
Protein oxidation is believed to be involved in the development of cataracts
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