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Medically reviewed by Vanessa Niles, R.N., M.D., F.A.C.O.G. —
Definition
Redox reaction, in plain English
'Redox' is short for reduction-oxidation. A handy memory aid is OIL RIG: Oxidation Is Loss, Reduction Is Gain (of electrons).
When an enzyme oxidizes a fuel molecule, NAD+ accepts two electrons and a hydrogen ion and becomes NADH. Later, NADH is oxidized back to NAD+ as it hands those electrons on.
- Short for
- Reduction-oxidation
- Oxidized
- Loses electrons (NADH → NAD+)
- Reduced
- Gains electrons (NAD+ → NADH)
How it connects
How redox reaction relates to NAD+
NIH notes that NAD and NADP are needed in most of the cell's redox reactions. The ratio of NAD+ to NADH works as a readout of a cell's redox state.
For your treatment
What redox reaction means for NAD+ therapy
'Redox balance' shows up often in wellness marketing. NAD+ is genuinely central to it, but that alone doesn't prove NAD+ products improve health.
- Free online consultation with a licensed U.S. provider
- NAD+ nasal spray or injection, plans from $166 a month if prescribed
- NAD+ has no FDA-approved use; compounded NAD+ isn’t FDA-approved
Questions
Redox reaction: common questions
What is a redox reaction?
A redox reaction is a chemical reaction in which electrons move from one molecule to another: one is oxidized (loses electrons) and the other is reduced (gains them). NAD+ and NADH are the cell's main electron carriers.
Is NAD+ oxidized or reduced?
NAD+ is the oxidized form; NADH is the reduced form.
Is oxidation the same as oxidative stress?
No. Oxidation is a normal chemical step. Oxidative stress means reactive molecules are building up faster than the body can neutralize them.
Will NAD+ therapy give me more energy?
That hasn't been shown in healthy people. NAD+ is essential for making ATP, but taking more hasn't been proven to raise energy.
Does exercise affect NAD+?
Exercise has been linked to higher NAMPT, the NAD+ recycling enzyme, in muscle in research studies, and regular activity supports healthy aging.
Should I see a doctor about tiredness first?
Yes, if it's new or lasting. MedlinePlus lists many causes of fatigue, including anemia, depression, medicines and sleep disorders.
Keep learning
Related NAD+ terms
Terms that connect to redox reaction, each explained on its own page.
- MoleculesNAD+NAD+ is the oxidized form of nicotinamide adenine dinucleotide, a coenzyme found in every living cell. It carries electrons for energy metabolism and is used by enzymes involved in DNA repair.
- MoleculesNADHNADH is the reduced form of NAD+. It carries high-energy electrons from the breakdown of food to the electron transport chain in mitochondria, where they help make ATP.
- MoleculesNADP+ and NADPHNADP+ is NAD+ with an extra phosphate group. Its reduced form, NADPH, supplies electrons for building molecules such as fats and cholesterol and for the cell's antioxidant defenses.
- Cell energyElectron transport chainThe electron transport chain is a series of four protein complexes in the inner membrane of mitochondria. It takes electrons from NADH, passes them to oxygen and uses the energy to make ATP.
Official sources
Redox reaction: sources and official resources
Official government and research sources behind this page, so you can check the facts yourself.
- NIH Office of Dietary SupplementsNiacin: Health Professional Fact Sheet
Explains how the body turns niacin (vitamin B3) into NAD, a coenzyme used by more than 400 enzymes.
- NIH National Library of Medicine (StatPearls)Biochemistry, Oxidative Phosphorylation
The redox reactions that move electrons from NADH and FADH2 to oxygen to make ATP.
- NIH National Library of Medicine (StatPearls)Biochemistry, Electron Transport Chain
How four protein complexes use electrons from NADH to drive ATP production.
- NIH Office of Dietary SupplementsNiacin: Fact Sheet for Consumers
What niacin (vitamin B3) does, how much adults need and which foods provide it.
Medically reviewed by Dr. Vanessa Niles, R.N., M.D., F.A.C.O.G., on October 12, 2026. This glossary is general education, not medical advice. NAD+ has no FDA-approved use, and compounded NAD+ is not FDA-approved or evaluated by the FDA for safety or effectiveness. Talk with a licensed provider before starting any supplement or treatment.
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