Nobody has published human pharmacokinetics showing what happens to the copper after a subcutaneous GHK-Cu injection: how much dissociates locally, how much reaches the liver, whether repeated administration accumulates, what happens to ceruloplasmin and serum copper over weeks
The irony, as you point out, is that this same rigidness does not apply to other medications that can be prescribed in a more flexible manner
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Viruses including hepatitis A, B, and E, Epstein-Barr virus, cytomegalovirus, and herpes simplex virus: They lead to liver damage or cirrhosis