ghk-cu peptide injection sites FDA scientists flag concerns with peptides as RFK Jr. tries to ease access : NPR Doctor Explains GHK-Cu the Glow

\n\n\n\n The compounds multimechanistic nature also makes it challenging to evaluate through conventional clinical trial frameworks, which are typically designed around single-mechanism drugs with well-defined target receptors and predictable dose-response relationships

[8]: Weiss JB, Phillips CJ, et,al.Stem cell, Granulocyte-Colony Stimulating Factor and/or Dihexa to promote limb function recovery in a rat sciatic nerve damage-repair model: Experimental animal studies

Albiston AL, McDowall SG, Matsacos D, Sim P, Clune E, Mustafa T, Lee J, Mendelsohn FA, Simpson RJ, Connolly LM, Chai SY

Prescribing them isn't off-label use

Several MET inhibitors have been introduced into the clinic, and are currently in all phases of clinical trials