The safety profile of GHK-Cu is well-established given its endogenous origin
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Very recently, direct-immunofluorescence microscopy of rat lower hindlimb muscles revealed that with aging, extracellular matrix (ECM)-bound HGF undergoes tyrosine residue (Y) nitration, as visualized by anti-nitrated Y-HGF monoclonal antibodies (mAbs, rat clones 3A11C6 and 6B82C3 raised in-house) in experiments employing three age-groups of young (2-month-old), adult (10-month-old), and old rats (20-month-old) 32
These endogenous primary antioxidants have high catalytic properties but, because the majority are mineral-dependent enzymes, their activity (reduced or enhanced) is directly affected by dietary intake
If you're going to use peptides, do it under the guidance of a physician who can monitor your blood work and your vital signs and ensure your restorative treatment isn't actually doing long-term damage