NADH: Uses, Benefits, Dosage & Safety
Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
Quick summary
NADH is the active, energy-carrying form of vitamin B3, marketed for energy and fatigue. Oral absorption is uncertain and evidence is limited.
What is NADH?
NADH (the reduced form of nicotinamide adenine dinucleotide) is a coenzyme made from vitamin B3 that carries electrons in cellular energy production, sold for fatigue and focus.
What NADH is commonly used for
In supplements, NADH is most often included for brain & memory, nerve health support. It is used as nutritional support, not as a treatment for any medical condition — the distinction matters, because the claims on a sales page are often stronger than the evidence allows.
How NADH works
NADH is central to the mitochondrial reactions that generate ATP, the cell's energy currency, which is the rationale for using it against fatigue.
What the evidence says
Here's an honest snapshot of what published research suggests about NADH — including where the evidence is limited.
- Small studies have explored NADH for chronic fatigue and jet lag with mixed, preliminary results. A key uncertainty is how well oral NADH survives digestion to actually raise cellular levels.
- Study quality and doses vary, and a result seen in research doesn't guarantee the same for any individual — use the sources below to check the current evidence on NADH rather than relying on marketing claims.
Typical dosage used in studies
Studies have used around 5–20 mg/day of stabilised NADH; optimal dosing and absorption are not well established. This is general information from research, not a personal recommendation or a dosing instruction.
Side effects and safety
NADH appears generally well tolerated in short studies; long-term data are limited, and it is best approached with realistic expectations. As with any supplement, it's sensible to introduce NADH on its own, use a trusted brand, and stop if you notice any reaction.
Medication interactions and who should avoid NADH
Medication & safety check
NADH can interact with certain medications or health conditions in ways that aren't always obvious. If you take any regular medication, are pregnant or breastfeeding, or manage a health condition, confirm NADH is appropriate for you before starting.
This is general information, not personal medical advice. If you take any medication, are pregnant or breastfeeding, or have a health condition, confirm it's safe to use NADH with your doctor or pharmacist first.
Sources & further reading
For authoritative background and the current research base on NADH, consult:
- PubMed — search the research on NADH
- NIH Office of Dietary Supplements
- NCCIH — National Center for Complementary and Integrative Health
- MedlinePlus — drugs, herbs & supplements
Frequently asked questions
Does NADH actually work?
Small studies have explored NADH for chronic fatigue and jet lag with mixed, preliminary results. A key uncertainty is how well oral NADH survives digestion to actually raise cellular levels. As with most supplements, results vary between people and the marketing is often stronger than the evidence — so it's worth checking the research before relying on it.
Is NADH safe to take?
For most healthy adults at normal doses it's generally well tolerated, but there are real cautions. NADH appears generally well tolerated in short studies; long-term data are limited, and it is best approached with realistic expectations. If you take medication, are pregnant or breastfeeding, or have a health condition, check with a doctor or pharmacist first.
What is NADH used for?
In supplements, NADH is mainly included for brain & memory, nerve health support — as nutritional support, not as a treatment for any medical condition.
Where you'll find NADH
On FactoWiki, NADH is the kind of ingredient you'll see discussed in these supplement categories. Each category guide breaks down what the evidence does and doesn't support.
Related ingredients to explore
Ingredients often studied or formulated alongside NADH — useful for understanding the full picture of a formula.