NAD+ is not technically a peptide, but it is sold and searched alongside peptides because researchers handle it the same way: as a lyophilised powder, stored in a vial, and used under controlled laboratory conditions. If you are looking to buy NAD+, understand its storage requirements, or read its COA, this article gives you the specifics.
What Is NAD+
NAD+ (nicotinamide adenine dinucleotide) is a small molecule, not a peptide. A peptide is a chain of amino acids. NAD+ is a coenzyme built from nicotinamide and adenine joined by a phosphate bridge. It shows up in research catalogues next to peptides because it arrives as a lyophilised powder, ships cold, and is handled the same way in a lab setting. The "peptide" label is a catalogue shorthand, not a chemistry term.
NAD+ Storage Temperature
Store lyophilised NAD+ powder at −20 °C in a sealed, airtight container. At room temperature, NAD+ degrades within days. At 4 °C (a standard lab fridge) you get a few weeks of stability if the vial stays dry and sealed. At −20 °C, the dry powder holds for at least 12 months. Some facilities store it at −80 °C for multi-year archiving, though −20 °C is sufficient for most research timelines.
The single biggest threat to NAD+ is moisture. The molecule breaks down rapidly in water, and the powder soaks up water from the air if left open. Always work quickly when opening a cold vial. Let it warm to room temperature before opening — that prevents condensation from forming inside the vial and wetting the powder.
NAD+ Lyophilised Powder Storage: Key Rules
- Keep it cold and dry. −20 °C, sealed, away from moisture at every step.
- Minimise freeze-thaw cycles. Each cycle adds stress. Aliquot into single-use amounts before freezing if you will use it repeatedly.
- Protect from light. NAD+ degrades faster under UV exposure. Amber vials or foil wrapping both work.
- Label with the date. Even well-stored powder should be used within 12 months of receipt.
Once NAD+ is dissolved in water for in vitro work, the clock runs much faster. Use the solution within 24–48 hours at 4 °C, or freeze immediately in small aliquots. Do not refreeze after thawing an aliquot.
NAD+ COA: What to Look For
A COA (certificate of analysis) is the document a supplier provides to show what was actually tested in the batch you are buying. For NAD+, a useful COA covers three things: identity, purity, and absence of harmful contaminants.
Identity is confirmed by mass spectrometry or HPLC. The result should match the molecular weight of NAD+ (663.4 g/mol). If a COA only lists a visual inspection or a melting point, that is not enough to confirm identity.
Purity is usually measured by HPLC (high-performance liquid chromatography — a method that separates compounds and measures how much of each is present). The main peak should correspond to NAD+ and the result should state a percentage.
NAD+ purity and the 99% standard — searches for "nad+ 99 purity" reflect a real benchmark. Research-grade NAD+ is typically supplied at ≥98% or ≥99% purity by HPLC. Anything below 95% falls short of standard research-grade benchmarks. The COA should state the method used, the result as a percentage, and the batch number so you can match the document to your vial.
A complete NAD+ COA also reports:
- Water content (Karl Fischer titration is the standard method — it measures how much water is trapped in the powder)
- Residual solvents, if any solvents were used in synthesis
- Heavy metals or microbial limits if the supplier tests for them
The batch number on the COA must match the lot number printed on your vial. If those numbers do not match, the COA tells you nothing about what you actually have.
NAD+ Purity Test Methods
The two tests worth knowing are HPLC and mass spectrometry.
HPLC separates the compounds in a sample and measures each one as a percentage of the total. It is the standard purity test. Mass spectrometry confirms identity by measuring molecular weight precisely. Together they confirm you have NAD+, and how much of it is actually NAD+ versus related breakdown products or synthesis impurities.
A COA showing only one method is acceptable. A COA showing both gives you more confidence.
Practical summary: NAD+ is a coenzyme that travels with peptides in research catalogues but is not one. Store the dry powder at −20 °C, sealed and away from light. When you read a COA, check that the purity result is ≥98% by HPLC and that the batch number matches your vial. Those details — temperature, timeline, and COA match — cover most of what can go wrong in a laboratory setting.
NXT Labs products are sold strictly as research chemicals for in vitro research, laboratory testing and analytical purposes only, and are not intended for use in any human or animal application.
NXT Labs supplies research peptides for laboratory use. Browse the full range or view current Certificates of Analysis.
