NAD+, short for nicotinamide adenine dinucleotide, is one of the few molecules in this library that every living cell makes and depends on continuously — not an occasional signaling molecule but a working part of the core machinery that keeps cellular metabolism running.
A coenzyme, not a peptide
Unlike the peptides that make up most of this catalog, NAD+ is a small-molecule dinucleotide with no amino acid backbone. That distinction matters for how it's produced, purified, and studied, but it doesn't make it any less central to cell biology — arguably the opposite, since NAD+-dependent reactions touch nearly every major metabolic pathway a cell runs. It's also one of the few compounds in this library that a researcher is as likely to encounter first in an introductory biochemistry course as in a specialized research protocol.
What makes it useful to cells
NAD+'s core trick is cycling between an oxidized form (NAD+) and a reduced form (NADH), letting it ferry electrons between metabolic reactions. This cycling underlies glycolysis, the citric acid cycle, and oxidative phosphorylation — the sequence of pathways that converts nutrients into usable cellular energy. On top of that redox role, NAD+ is also consumed outright as a substrate by sirtuins and PARP enzymes, linking it to research on chromatin regulation and DNA-damage response as well as pure energy metabolism.
Where this shows up in research
In practice, that combination of roles puts NAD+ at the center of several overlapping research areas: cellular-energy and mitochondrial-function studies, sirtuin- and stress-response signaling, DNA-repair biology, and — because NAD+ levels have been observed to decline with age in various tissues — aging-adjacent metabolic research. What ties these threads together is that they all draw from the same limited intracellular NAD+ pool, so a cell's biosynthesis and salvage capacity effectively sets a ceiling on how much any one of these downstream processes can draw on at once. A closer look at the underlying chemistry is in NAD+ mechanism of action, and the specific applications this supports are broken down in NAD+ research applications.
How it's supplied for laboratory use
Research-grade NAD+ is supplied as a lyophilized powder — commonly in 500 mg quantities — accompanied by a batch-specific certificate of analysis confirming identity and purity. Because it's freeze-dried rather than liquid, it follows the same general handling logic as other lyophilized laboratory compounds until it's reconstituted for a given protocol, though its specific sensitivity to heat, light, and prolonged oxygen exposure in solution means the fine details of that handling differ from compound to compound.
Product page: NAD+ research vials.
Research Use Only. Supplied strictly for laboratory research and development — not for human or veterinary use, consumption, or any therapeutic or diagnostic purpose. This article is research education, not usage guidance.