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Injectable GHK-Cu is delivered systemically rather than absorbed through the skin, which produces different (and generally more pronounced) systemic effects than topical copper peptide cosmetics

Peptide therapy is generally considered to be very safe, as the body readily accepts these peptides since they are naturally produced and present in the bodys cells and tissues

These features are essential for oxygen transport, since RBCs have to undergo repeated shape changes without fragmentation, to assure their passage and oxygen perfusion through all vascular networks, namely, through capillary blood vessels with smaller lumen diameter than that of RBCs [6, 7]

Further studies are needed to determine whether other factors may also be involved