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Glutathione plays a critical role in protecting cells from oxidative stress while also supporting the bodys natural detoxification systems

In vitro studies have shown increased collagen I and III gene expression and protein production in fibroblast cultures treated with GHK-Cu, with effects observed across a range of nanomolar to low micromolar concentrations

Some research suggests it could improve insulin sensitivity and reduce lipid accumulation in hepatocytes, though the clinical evidence in humans remains limited and inconsistent

This is the strongest peer-reviewed human evidence in the T4 family, although the formulation tested was full-length T4, not the TB-500 fragment used in commercial peptide products