Literature context: this guide names three enzyme groups that use NAD+. They are sirtuins, PARPs and CD38. This count is not a product result.
NAD+ enzyme-family literature contextPlain-English research guideNAD+
NAD+ research guide
Everything worth knowing, without the jargon.
NAD+ is a coenzyme - a small helper molecule every living cell needs to run its chemistry. It is not a peptide and not an approved medicine. This guide walks through what the research actually says about it, and what it does not.
Form Labs materials are research reference materials, not the approved medicines; no Form Labs product is approved for human or veterinary use.
REV 2026-10 ยท 1 Oct 20263 peer-reviewed studiesResearch-use-only context
What the papers reportThird-party literature - not product claims
Identity context: NAD+ and NADH are the two paired redox forms named in this guide. This is chemistry context, not a product result.
NAD+ and NADH redox-pair identityWhy it matters
Why is NAD+ studied?
NAD+ is studied because it is a coenzyme, a small helper molecule that every living cell needs to run its chemistry. NAD+ is not a peptide. Researchers study how it moves electrons as part of the NAD+/NADH pair. They also study three enzyme families that use NAD+ up: sirtuins, PARP and CD38.
NAD+ literature and laboratory findings.
Research use only means this material is sold for in-vitro lab work. This is controlled experiments outside a living body. It is not tested, packaged or approved as a medicine, supplement or food. Do not use it in or on people or animals.
Belenky et al. (2007) reviewed how cells make, recycle and use up NAD+, based on published cell-biology experiments. Imai et al. (2000) reported that Sir2 needed NAD+ in purified yeast protein and cell extracts. No animals or people were involved.
The source guide keeps study context apart from Form Labs product claims.
Study observations
What laboratory observations have NAD+ studies reported?
Imai et al. (2000) found that purified yeast Sir2 needed NAD+ to strip acetyl groups from histones. The enzyme used up NAD+ as it worked. The experiment used purified protein and yeast cell extracts, with no animals or people. Covarrubias et al. (2021) reviewed the wider field. Findings about precursors stay separate from findings about NAD+.
NAD+ laboratory findings Findings stay tied to the cited study and its model.
Redox literature
Belenky et al. (2007) reviewed how cells make, recycle and use up NAD+, based on published cell-biology experiments.
Sir2 laboratory experiment
Imai et al. (2000) reported that Sir2 needed NAD+ in purified yeast protein and cell extracts. No animals or people were involved.
Precursor distinction
Covarrubias et al. (2021) reviewed mostly animal evidence. They kept NMN and NR separate from NAD+ itself.
Pharmacology at a glance
- Research code
- NAD+
- Class
- NAD+ identity, redox-pair chemistry, and NAD+-using enzyme literature. Class here means the research category that the source guide names.
- Molecule
- NAD+ / nicotinamide adenine dinucleotide. The identity wording comes from the source guide and the matching product record.
- Reported half-life
- Not listed in the source guide for this entry. Half-life is the time it takes for a measured amount to fall by half.
- Originator
- Not listed in the source guide. Form Labs did not run the cited studies.
- Approval status
- Laboratory research material only.
What it has been studied for
What has NAD+ been studied for?
NAD+ research covers three study areas. The first is NAD+ redox chemistry and the enzymes that use it. The second is the sirtuin record, where Sir2 and other sirtuin enzymes use NAD+ as a co-substrate (a partner molecule). The third is NAD+ pathway reviews across metabolism, DNA repair, chromatin, ageing cells and immune cells. All three are literature topics, not product results.
Study areas from the published literature.
NAD+ redox and enzyme-substrate biology
Study topic: how NAD+ sits in redox chemistry and in enzyme systems that consume it.
Belenky et al., Trends Biochem Sci, 2007Sirtuin co-substrate record
Study topic: Sir2 and sirtuin enzymes using NAD+ as a co-substrate during deacetylase reactions.
Imai et al., Nature, 2000NAD+ pathway overview
Study topic: cellular pathways where NAD+ is discussed across metabolism, DNA repair, chromatin, senescence, and immune-cell literature.
Covarrubias et al., Nat Rev Mol Cell Biol, 2021The studies
What did the NAD+ studies find?
This guide cites three NAD+ studies: two reviews and one lab experiment. Belenky et al. (2007) surveyed how cells make, recycle and spend NAD+. Imai et al. (2000) showed that the sirtuin enzyme Sir2 only worked when NAD+ was present. That work used purified yeast protein, with no animals or people. Covarrubias et al. (2021) reviewed the wider NAD+ pathway.
Open any study for a plain summary, what it measured, the finding, and a link to the paper.
A survey of how cells make NAD+, how they recycle it, and which enzymes use it up.
- Studied in
- Published cell-biology papers on yeast, bacterial and mammalian cells.
- Design
- The authors read the existing experiments on NAD+. They sorted them into the routes cells use to build the molecule and the routes that use it up.
- Measured
- Nothing new was measured. The value of the paper is its map: which reactions make NAD+, and which ones spend it.
Cells do not make NAD+ once and keep it (Belenky et al., 2007). They run a constant recycling loop. Enzymes such as sirtuins, PARPs and CD38 break NAD+ apart when they act. That is why the same molecule turns up in papers on energy metabolism and in papers on DNA repair. It is spent in both places.
DOI 10.1016/j.tibs.2006.11.006The experiment that showed the sirtuin enzyme Sir2 cannot do its job without NAD+.
- Studied in
- Purified yeast Sir2 protein and yeast cell extracts, in vitro (in the lab, not in a living body).
- Design
- The researchers gave the Sir2 enzyme its target and watched whether it acted. They ran it once with NAD+ present and once with NAD+ absent.
- Measured
- Whether Sir2 stripped acetyl groups from histones, the spool proteins that DNA winds around. Also whether NAD+ was used up while it did so.
Sir2 only worked when NAD+ was present. It used the NAD+ up as it went (Imai et al., 2000). That tied an enzyme that controls genes to the cell's energy chemistry. The amount of NAD+ around becomes a signal the enzyme can read. Most later research that links NAD+ to ageing traces back to this link.
DOI 10.1038/35001622A survey of where NAD+ research had reached, and of how much of the evidence comes from animals instead of people.
- Studied in
- Published papers on cell cultures, mice, and a smaller number of human trials.
- Design
- The authors reviewed the research on NAD+ across metabolism, DNA repair, cell ageing and immune signalling.
- Measured
- No new measurement. The review states plainly which claims rest on mouse data and which have human evidence behind them.
NAD+ levels were reported to fall with age in several tissues. At the same time, the enzymes that use up NAD+ grow busier (Covarrubias et al., 2021). The review is careful about what this shows. Most intervention evidence comes from animals and from the precursors NMN and NR, not from NAD+ itself. So the human picture remained open.
DOI 10.1038/s41580-020-00313-xEvidence and limitations
What does the NAD+ research mean, and what does it not?
This NAD+ guide is a map of the literature, not a product claim. Most intervention evidence comes from animals and from the precursors NMN and NR, not from NAD+ itself (Covarrubias et al., 2021). So read findings about those precursors as separate from findings about NAD+. Where the source gives no participant counts or study details, this page does not invent them.
The source guide is a literature map, not a product claim
The cited papers give background on identity, pathway, markers, models and lab methods. They are not Form Labs results or promises.
Study details are limited to the source record
The source guide may give no participant counts, model details, study amounts or study-stage labels. This page does not invent them.
Label and available report
Follow the product label and any verified matching COA for storage and batch decisions. Source storage note: 2-8 C, dry and protected from light.
Lab handling
How is NAD+ handled as reference material?
NAD+ is laboratory reference material. It is not for human consumption or veterinary use. Storage and lot checks follow the product label and any verified matching certificate of analysis (COA). This guide's catalogue record notes storage at 2-8 C and protection from light.
Research-use boundary
Follow the product label and laboratory procedures for storage.
Educational boundary
This guide sums up third-party research. Form Labs did not run the cited studies.
Research-use boundary
For laboratory research use only. 21+ only. Not for human consumption or veterinary use.
Glossary
Plain-English definitions.
- NAD+
- Nicotinamide adenine dinucleotide. It is a coenzyme named in papers on redox chemistry and on enzymes that use it.
- NADH
- The paired form of NAD+ that has taken on electrons. The two forms cycle back and forth in redox chemistry.
- Electron transfer
- Movement of electrons from one molecule to another during a chemical reaction.
- Coenzyme
- A small molecule that helps enzymes carry out chemical reactions.
- Sirtuin
- An enzyme family that needs NAD+. It appears in papers on removing chemical tags from proteins and on cell signalling.
- PARP
- Poly(ADP-ribose) polymerase. It is an enzyme family named in DNA-repair papers.
- CD38
- An enzyme on the surface of cells. It appears in papers on immune-cell signalling and on enzymes that use up NAD+.
- COA
- Certificate of analysis. It is the batch paperwork that controls identity, purity, appearance and release checks.
- Research use only
- A lab-only boundary. It means not for human consumption, or for veterinary, medical or cosmetic use.
- Literature context
- A plain summary of what the cited papers discuss. It is not a product result.
FAQ
What are the most common questions about NAD+?
This guide describes NAD+ as a coenzyme, not a peptide. The common questions cover how NAD+ differs from NADH, and how it differs from NMN and NR. They also cover which enzymes use up NAD+, whether NAD+ declines with age, what the Sir2 experiment showed, and its Australian status. Form Labs supplies NAD+ as laboratory reference material only.
NAD+ is a coenzyme, a small helper molecule that every living cell needs to run its chemistry. It is not a peptide, and it is not an approved medicine. Form Labs supplies it strictly as laboratory reference material.
NAD+ and NADH are the same molecule in two states. NAD+ is the state before it takes on electrons. NADH is the state after. The cell cycles it back and forth all day. That is why papers write the pair as NAD+/NADH and do not treat them as two separate things.
No. NMN and NR are precursors, which are molecules the body turns into NAD+. This matters when you read the literature. Most human work in this field used those precursors, not NAD+ itself. So a finding about NMN or NR is not a finding about NAD+.
Three enzyme families use up NAD+ outright. They are sirtuins, PARPs and CD38. PARPs are called in when DNA is damaged. Sirtuins are studied for how genes get switched on and off. Because these families use it up, researchers say the cell has to keep replacing NAD+.
Reviews report that NAD+ levels fall with age in several tissues. At the same time, the enzymes that use it up grow busier. The review authors are careful about what this shows. Most intervention evidence comes from animals and from the precursors NMN and NR, not from NAD+ itself. The human picture remains open.
Sir2 only worked when NAD+ was present. It used the NAD+ up as it went. That tied an enzyme that controls genes to the cell's energy chemistry. It was a lab experiment on purified yeast protein, with no animals and no people.
No. NAD+ is not an approved medicine and is not on the Australian Register of Therapeutic Goods. Form Labs supplies it as laboratory reference material only, not for human or veterinary use.
References
Every figure, sourced.
Educational references to third-party literature. Form Labs is unaffiliated with the study authors.
Plain note: NAD+ redox and enzyme-substrate overview. Citation: Belenky et al., Trends Biochem Sci, 2007.. A DOI is a permanent link code for the article. DOI: 10.1016/j.tibs.2006.11.006.
DOIPlain note: Sir2/sirtuin NAD+ co-substrate paper. Citation: Imai et al., Nature, 2000.. A DOI is a permanent link code for the article. DOI: 10.1038/35001622.
DOIPlain note: Cellular NAD+ pathway review. Citation: Covarrubias et al., Nat Rev Mol Cell Biol, 2021.. A DOI is a permanent link code for the article. DOI: 10.1038/s41580-020-00313-x.
DOICitations are provided for education only. No therapeutic, weight-loss, or efficacy claims are made.
How we produce these guides
These guides are written and maintained in-house by the Form Laboratories research team. They summarise published literature and link to the cited papers. Form Laboratories did not run those studies. They are not authored by a named clinician and are not medical advice.
Findings remain tied to the study population, model and limits. Cell and animal observations remain separate from clinical results. Everything we supply is research-use-only reference material, not for people or animals.
The product
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