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It uses a methyl group donated by S-adenosylmethionine (SAM) to methylate nicotinamide a vitamin B3 form that would otherwise be recycled back into NAD+

Circadian NNMT expression follows a diurnal pattern in adipose tissue, with peak enzymatic activity occurring in the late afternoon and evening in rodent models

NNMT inhibitors require fasted-state dosing to eliminate nicotinamide competition this is mechanism-driven, not a general peptide rule

Most antibiotics, methotrexate, and pyrimethamine invalidate folic acid and vitamin B12 diagnostic microbiological blood assays

This is problematic because muscle mass contributes to metabolic rate, functional capacity, and long-term health