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No mutagenicity, carcinogenicity, or reproductive toxicity has been demonstrated

Current Research Limitations Most clinical studies on GHK-Cu involve: Topical formulations In vitro research Animal models Systemic (non-injectable) delivery There is insufficient evidence in peer-reviewed literature to support: standardized injection techniques validated injectable dosing regimens long-term safety or efficacy data for injectable use As a result, clinicians should approach injectable discussions with caution and rely on evidence-based peptide education rather than anecdotal protocols

doi: 10.1016/S1474-4422(16)00062-4, 132 WuC

One of the crucial reasons is also having addressed molecular targets and key neuropathological changes acting too late in the disease, such as A plaques and hyperphosphorylated tau protein deposits (Gody et al., 2016)