Is NMN (Nicotinamide Mononucleotide) Safe with Tamoxifen?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Avoid NMN supplementation during tamoxifen therapy unless explicitly approved by your oncologist. Report any new symptoms promptly.
Why this interaction occurs
Tamoxifen induces apoptosis in ER-positive breast cancer cells partly by disrupting mitochondrial membrane potential and reducing NAD+ availability. NMN-driven NAD+ repletion may restore mitochondrial function in tumor cells, potentially enabling resistance to tamoxifen-induced cell death. Preclinical studies demonstrate that NAD+ elevation can upregulate SIRT1/PARP pathways that promote tumor cell survival.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 22,724 reports mentioning Tamoxifen. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Tamoxifen + 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 NMN (Nicotinamide Mononucleotide) interactions → · All Tamoxifen interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.