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Medically reviewed by Vanessa Niles, R.N., M.D., F.A.C.O.G. —
Definition
ATP, in plain English
ATP stores energy in the bonds between its phosphate groups. Breaking one off releases energy that powers muscle contraction, nerve signals and the building of new molecules. MedlinePlus Genetics calls ATP the cell's main energy source.
Cells recycle ATP constantly: once used, it becomes ADP, and mitochondria recharge it back to ATP.
- Full name
- Adenosine triphosphate
- Made mostly in
- Mitochondria
- Powered by
- Electrons from NADH and FADH₂
How it connects
How ATP relates to NAD+
NAD+ doesn't make ATP directly. It collects electrons from food, becoming NADH, and delivers them to the electron transport chain, which powers ATP synthase.
For your treatment
What ATP means for NAD+ therapy
Claims that NAD+ boosts ATP and energy haven't been proven in human trials of NAD+ therapy.
- 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
ATP: common questions
What is ATP?
ATP (adenosine triphosphate) is the main energy currency of cells. Most of it is made in mitochondria using electrons carried by NADH, which is why NAD+ is tied to energy.
Is ATP the same as NAD+?
No. Both contain adenosine, but ATP is an energy carrier and NAD+ is an electron-carrying coenzyme.
Does NAD+ give you energy?
NAD+ is needed to make ATP, but studies haven't shown that NAD+ therapy improves energy levels in healthy people.
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 ATP, each explained on its own page.
- Cell energyMitochondriaMitochondria are structures inside cells that turn energy from food into ATP, the cell's main energy currency. NAD+ and NADH are central to how they do it.
- 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.
- 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.
- Cell energyKrebs cycleThe Krebs cycle, or citric acid cycle, is a loop of reactions in mitochondria that breaks down fuel from food and loads electrons onto NAD+ to make NADH for energy.
Official sources
ATP: sources and official resources
Official government and research sources behind this page, so you can check the facts yourself.
- MedlinePlus Genetics (National Library of Medicine)Mitochondrial DNA
What mitochondria do, including making ATP, the cell's main energy source.
- NIH National Library of Medicine (StatPearls)Biochemistry, Electron Transport Chain
How four protein complexes use electrons from NADH to drive ATP production.
- 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 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.
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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