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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)

Patients often prefer injections when speed is the main priority

Some practitioners advocate intramuscular injection near injury sites for deeper penetration, particularly for large muscle injuries or post-surgical recovery

And the doctor who prescribed it would refute the lack of data, saying the absence of evidence is not evidence of absence, and that his patients are deriving substantial benefit without side effects

GHK-Cu has extensive preclinical research (cell studies and animal models) with strong, consistent results

doi: 10.1016/j.cell.2013.12.010 71 SatoHNomuraSMaebaraKSatoKTambaMBannaiS