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doi: 10.1016/j.abd.2021.10.002 10 AlamMRizwanullahMMirSRAminS

The article names patients with kidney disease, liver impairment, and anyone taking immunosuppressants

Active cancer is a relative contraindication: because GHK-Cu promotes cell growth, providers avoid it in uncontrolled malignancy (though ironically it also has anti-cancer gene effects)

Dosage: In human sleep studies, researchers have used intravenous doses of 25nmol per kilogram.13 14 Intravenous administration boasts higher bioavailability than, say, the subcutaneous route,28 which is the more common mode of administration for peptides, so a home-use case would likely involve a higher dose