The synthetic versus natural distinction GHK-Cu exists naturally in human blood plasma, saliva, and urine
R., Min, H., Son, J., Han, H., Kang, M., & Kwon, O
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Advanced formulations use ionic liquid-based microemulsions that improve local delivery by approximately three-fold while retaining biological function
Co-administration depletes the same glutathione reserves that NAC is trying to replenish, and Rumack's toxicology review documents the additive hepatotoxic risk explicitly