what does ghk-cu peptide do Side Effects: the Research Say? Doctor Explains GHK-Cu for Skin Rejuvenation -

This isn't about one being 'better' than the other

Injectable Advantages Injectable GHK-Cu bypasses the skin barrier entirely, delivering the peptide directly to subcutaneous tissue with near 100% bioavailability

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PMID 40789979 - a more recent review summarising regenerative potential and interpretive caveats

Though first discovered as a soluble, periplasmic binding protein (Csp1/Csp2) in methanotrophs and proposed to function in the metalation of pMMO, the cytoplasmic Csp3 is now considered the far more prevalent Csp, and has now been identified in at least ten different bacterial phyla

These findings suggest that the peptides may be valuable for treating complex injuries and improving overall recovery processes