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The combination of copper peptides and retinol can cause irritation in sensitive individuals, though many people tolerate both when used at separate times

Characterization of a recombinant soluble form of human placental leucine aminopeptidase/oxytocinase expressed in Chinese hamster ovary cells

Copper Peptides for Hair Growth Copper peptides such as GHK-Cu may improve scalp health, boost follicle signaling, and support hair growth

GHK-Cu has increased endothelial proliferation, capillary density, and perfusion in wound and ischemia models, making it of interest in vascular injury and aging studies

The safety margin is over 300 times the therapeutic dose, making GHK-Cu one of the safest peptides available for research use

PMID 5642099