Is NAD Precursors (Niacin/Nicotinamide Riboside) Safe with Metformin?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Inform your diabetes care team before starting NAD precursor supplements. Monitor HbA1c and fasting glucose at regular intervals.
Why this interaction occurs
Metformin's glucose-lowering action depends on mild mitochondrial complex I inhibition and subsequent AMPK activation. High-dose NAD precursors can restore mitochondrial membrane potential and NAD+/NADH ratios, which may blunt AMPK activation and reduce metformin's therapeutic efficacy. Niacin forms of NAD precursors also carry independent risk of raising fasting glucose at high doses.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 432,898 reports mentioning Metformin. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Metformin + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All NAD Precursors (Niacin/Nicotinamide Riboside) interactions → · All Metformin interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.