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Medically reviewed by Vanessa Niles, R.N., M.D., F.A.C.O.G. —
Definition
NAD+ salvage pathway, in plain English
Many enzymes, including sirtuins, PARPs and CD38, break NAD+ apart and release nicotinamide. Rather than waste it, cells rebuild NAD+ in two steps: NAMPT makes NMN, and NMNAT enzymes then make NAD+.
Nicotinamide riboside (NR) joins the same route by first becoming NMN.
- Recycles
- Nicotinamide
- Key enzyme
- NAMPT (rate-limiting)
- Steps
- Nicotinamide → NMN → NAD+
For your treatment
What NAD+ salvage pathway means for NAD+ therapy
Precursor supplements such as NR and NMN feed into this pathway, while NAD+ therapy supplies NAD+ itself. How each affects tissues in people is still being studied.
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- NAD+ has no FDA-approved use; compounded NAD+ isn’t FDA-approved
Questions
NAD+ salvage pathway: common questions
What is the NAD+ salvage pathway?
The NAD+ salvage pathway recycles nicotinamide, which is released whenever enzymes use NAD+, back into NAD+. It's the main way most human cells keep their NAD+ supply topped up.
Why is it called 'salvage'?
Because it salvages nicotinamide, a by-product of NAD+ use, and rebuilds NAD+ from it instead of making it from scratch.
Does the salvage pathway slow down with age?
Some research suggests NAMPT activity falls in certain tissues with age while NAD+-consuming enzymes like CD38 rise. Human evidence is still developing.
Does NAD+ therapy change how these enzymes work in people?
That hasn't been shown. Most research on NAD+ enzymes comes from cells and animals.
Are there medicines that target NAD+ enzymes?
Yes, in cancer care: PARP inhibitors treat some cancers, and a CD38 antibody (daratumumab) treats multiple myeloma. They aren't used to raise NAD+.
Why does enzyme research matter for NAD+ therapy?
It explains why NAD+ is worth studying. Plausible biology isn't the same as proof that NAD+ therapy helps people.
Keep learning
Related NAD+ terms
Terms that connect to NAD+ salvage pathway, each explained on its own page.
- Enzymes & pathwaysNAMPTNAMPT (nicotinamide phosphoribosyltransferase) is the enzyme that turns nicotinamide into NMN. It's the rate-limiting step of the salvage pathway that recycles NAD+.
- Vitamins & precursorsNicotinamideNicotinamide, also called niacinamide, is a form of vitamin B3. It's the building block the body recycles to remake NAD+, and unlike nicotinic acid it doesn't cause skin flushing.
- Vitamins & precursorsNicotinamide mononucleotideNicotinamide mononucleotide (NMN) is the molecule one step before NAD+. The body makes it from nicotinamide or NR, and it's studied, and sold, as a way to raise NAD+.
- Enzymes & pathwaysCD38CD38 is an enzyme on the surface of many cells, especially immune cells, that breaks down NAD+. Studies in mice suggest rising CD38 is a key reason NAD+ falls with age.
Official sources
NAD+ salvage pathway: sources and official resources
Official government and research sources behind this page, so you can check the facts yourself.
- NIH PubMed CentralCovarrubias et al. NAD+ metabolism and its roles in cellular processes during ageing (2021)
Review of how NAD+ works in cells and how levels change with age.
- NIH National Center for Biotechnology InformationNAMPT nicotinamide phosphoribosyltransferase [human] (NCBI Gene)
Gene record for NAMPT, the enzyme that turns nicotinamide into NMN.
- 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 PubMedImai and Guarente. NAD+ and sirtuins in aging and disease (2014)
Review of how sirtuins depend on NAD+ and why that matters for aging research.
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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