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No, there are no established long-term risks in humans because sufficient long-term human studies have not been conducted

10.1201/b14635-16 Kardiochir Torakochir Pol

However, improper useespecially through self-injectioncan pose serious risks.. The Danger of Copper Toxicity If the wrong amount of copper peptide is injected, there is a risk of copper toxicity

D., Aladag, T., Duran, I

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Comparison between two truncated MOR in the C terminal tail in HEK cells over-expressing a GRK2 peptide known to block G -mediated recruitment of GRK at the plasma membrane suggest that the amino acids sequence 354TSST357 plays a major role in GRK2-mediated MOR desensitization upon DAMGO exposure (Wang, 2000)