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The optimal concentration for over-the-counter products typically ranges from 0.1% to 2% GHK-Cu, with many studies suggesting 0.5% as an effective sweet spot for benefits without adverse reactions
This is especially true in the case of autoimmune thyroid diseases [65]
[DOI] [PubMed] [Google Scholar] Commandeur J.N., Stijntjes G.J., Vermeulen N.P
P.MassicotteJ
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