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GHK-Cu

For example, an anti-aging brand may highlight the peptides relationship with maintaining skin firmness and overall skin vitality

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Evidence level: Unsupported by the cited record Sources: Selective and membrane-permeable small molecule inhibitors of nicotinamide N-methyltransferase reverse high fat diet-induced obesity in mice., Nicotinamide N-methyltransferase inhibition mitigates obesity-related metabolic dysfunction., ClinicalTrials.gov exact-name search, accessed 2026-07-12 How to read this: Direct efficacy findings come from obese mice, not human trials

Developed at Erasmus University Medical Center, it made headlines in 2017 when treated aged mice showed restored organ function and physical rejuvenation