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10.1016/S0140-6736(71)90970-6
Yoshida Y, Noshiro M, Aoyama Y, Kawamoto T, Horiuchi T, Gotoh O
The problem: Ice crystal formation can damage peptide structure Potency loss Unproven benefit vs proven risk Better approach: Mix smaller batches more frequently Use within 28-30 days while refrigerated Mistake 4: Storing in fridge door The fridge door experiences the most temperature fluctuation
(Cell Mol Gastroenterol Hepatol, 2016) reported the effect was lost in PepT1-knockout mice
Structure visualization and residue selection Protein structures of glutaredoxins were inspected using Swiss-PDB Viewer 54
Wrinkle reduction Yes Regeneration and healing Yes Antioxidant effects Yes Improved skin elasticity Yes Safety of use Yes Scientific data and sources Research summary Level of evidence Preliminary Number of included studies: 20 8 studies 5 studies 4 studies 1 study 1 study 1 study Final comment: Although systematic literature analyses and results from in vitro and animal model studies indicate the effectiveness of GHK-Cu in skin regeneration and wrinkle reduction, there are no direct randomized controlled trials in humans
