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What experts say about peptides and long-term safety We dont know enough about injectable peptides to say what kinds of effects they may have on long-term health or safety

GHK-cu (50 mg) Copper-binding tripeptide for regenerative and cosmetic research Research use only GHK-cu is a naturally occurring copper-binding tripeptide composed of the sequence Gly-His-Lys complexed with copper (II)

JAMA 312:26682675

Copper accumulation also becomes a theoretical concern at extreme doses, though practical protocols stay well below problematic thresholds

Degradation of the extracellular matrix components by bacterial-derived metalloproteases: implications for inflammatory bowel diseases

The development of enzyme-inhibiting peptides requires careful consideration of selectivity and duration of action