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It is studied as a selective inhibitor of nicotinamide N-methyltransferase (NNMT), an enzyme linked to metabolic and oncogenic pathways in research models

Older people and people with digestive tract conditions are most at-risk for developing vitamin B12 deficiencies

Metformin improves peripheral insulin sensitivity in youth with type 1 diabetes

For those who choose to use topical GHK-Cu, a few evidence-aligned practices reduce the likelihood of side effects

Timing Baseline Marker Lipid panel Why it matters Adds cardiometabolic context during body-composition or growth-pathway research

Iron deficiency: It may interfere with iron absorption