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Yes, one of the best things about GHK-Cu is that it's known for being remarkably well-tolerated

Supplementary figures ACKNOWLEDGEMENTS This work was supported by the National Natural Science Foundation of China [(NSFC 82370597 (X.L.), NSFC 32171175 (X.L.), and NSFC 82270619(Y.M.)] and the National Key R&D Program of China [2022YFC3502101(Y.M.)]

The researchers suggest that during evaluation, the peptide increased cell viability and migration and increased tube formation on matrices, which is commonly exposed to research models as a lab proxy for angiogenic behavior