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These five substances are tested: Marijuana (THC) and its metabolites, including THC-COOH Cocaine and its primary metabolite benzoylecgonine Opiates including heroin, morphine, and codeine Amphetamines including methamphetamine and MDMA Phencyclidine (PCP) Notice what is absent

2 4 Researchers have further proposed that GHK-Cu may regulate expression of genes associated with inflammation, antioxidant defence, DNA repair and tissue regeneration

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However, it is strictly intended for in vitro or non-human in vivo research

Gastrointestinal Tract Studies: Examining the peptide's origin and its subsequent effects on gut mucosal integrity in laboratory settings