Scientifically reviewed by Dr Stephan Hansberg
Is NAD+ a peptide? What NAD+ actually is
NAD+ is not a peptide. It is a dinucleotide coenzyme built from two nucleotides, with no amino acids. This guide covers its structure, why it is sold alongside peptides, and how it behaves in solution.
Key takeaways
- •NAD+ is not a peptide: it is a dinucleotide coenzyme made of two nucleotides joined through their phosphate groups, with no amino acids or peptide bonds.
- •Its formula is C21H27N7O14P2 (663.4 g/mol); the reduced form, NADH, carries two more hydrogens.
- •NAD+ is sold by peptide suppliers because it sits in the same research and longevity catalogues, not because it is chemically related.
- •In solution, the oxidised form NAD+ is more sensitive to alkaline conditions and the reduced form NADH to acid; buffer and temperature affect long-term stability.
- •The Celyfe NAD+ Precision Pen holds 500mg in a 3ml cartridge; batch A26085 has a published certificate reporting 99% purity by HPLC.
The short answer
No, NAD+ is not a peptide. Nicotinamide adenine dinucleotide is a coenzyme made of two nucleotides, one carrying adenine and one carrying nicotinamide, joined through a pair of phosphate groups. Peptides are chains of amino acids linked by peptide bonds, and NAD+ contains neither.
It is often sold alongside research peptides because both appear in the same laboratory and longevity research catalogues, which is a commercial grouping rather than a chemical one.
What NAD+ is made of
NAD+ is assembled from two nucleotides. One is adenosine monophosphate (AMP): the base adenine, a ribose sugar and a phosphate. The other is nicotinamide mononucleotide (NMN): nicotinamide, a ribose sugar and a phosphate. The two phosphates are linked to each other, forming a pyrophosphate bridge that holds the molecule together.
The plus sign refers to the positively charged nicotinamide ring in the oxidised form. When NAD+ accepts electrons in a redox reaction it becomes NADH, the reduced form.
| Property | NAD+ | A typical peptide (e.g. BPC-157) |
|---|---|---|
| Building blocks | Two nucleotides (AMP and NMN) | Amino acids |
| Linkage | Phosphate (pyrophosphate) bridge | Peptide (amide) bonds |
| Formula | C21H27N7O14P2 | C62H98N16O22 |
| Molar mass | 663.4 g/mol | 1419.5 g/mol |
| Chemical class | Dinucleotide coenzyme | Pentadecapeptide |
| Role studied in research | Redox coenzyme and enzyme substrate | Signalling molecule in cell and animal models |
What NAD+ does in the cell
NAD+ is present in every living cell. Its best-known role is as an electron carrier: it cycles between NAD+ and NADH in glycolysis, the citric acid cycle and the transfer of electrons to the mitochondrial respiratory chain. It is also consumed as a substrate by several enzyme families, including the sirtuins, the poly(ADP-ribose) polymerases (PARPs) and CD38, which is why cellular NAD+ levels and their changes with age are a major research topic.
Because NAD+ is a coenzyme rather than a signalling peptide, the research questions are different: they focus on cellular NAD+ levels, the pathways that make and consume it, and the precursors that feed those pathways.
Why it is sold alongside peptides
Peptide suppliers carry NAD+ for practical reasons. The laboratories that study peptide signalling often also study cellular metabolism and ageing, NAD+ is handled with similar cold-storage and documentation practices, and it can be supplied in the same pre-filled format. The grouping is about the customer and the format, not the chemistry.
For a buyer, the important point is that the quality checks are the same in principle: identity, purity by HPLC, and a certificate for the specific batch.
Common points of confusion
Because NAD+ is sold next to peptides, a few misunderstandings come up often. Clearing them up makes product labels and research papers easier to read.
- NAD+ is not a vitamin either, although it is made in the body partly from forms of vitamin B3 (niacin), such as nicotinamide and nicotinic acid.
- NAD+, NADH, NADP+ and NADPH are related but distinct molecules. NADP+ carries an extra phosphate group and is used mainly in biosynthetic and antioxidant pathways.
- NMN and nicotinamide riboside (NR) are precursors that cells convert into NAD+; they are not NAD+ itself. Our guide to NAD+ vs NMN vs NADH compares them.
- A product labelled NAD+ should state the mass of NAD+ and, for a solution, the volume, so the concentration can be checked against the certificate.
How NAD+ purity is checked
As with peptides, purity is usually measured by high-performance liquid chromatography. The sample is separated into its components and the share of the signal that belongs to NAD+ is reported as the purity. Because NAD+ absorbs ultraviolet light at 260 nm through its adenine ring, and NADH also absorbs at 340 nm through its reduced nicotinamide ring, UV detection can distinguish the oxidised and reduced forms, which matters when checking that a product labelled NAD+ has not partly converted.
A useful certificate names the batch, the laboratory, the method, the measured purity and the test date, so it can be matched to the cartridge in hand.
NAD+ in solution: stability
The pyridine nucleotides have been studied for stability for decades. Classic work by Lowry and colleagues in 1961 showed that the oxidised forms such as NAD+ are destroyed by alkaline conditions while the reduced forms such as NADH are destroyed by acid, which is why NAD+ solutions are generally kept neutral to mildly acidic.
A 2024 study in Molecules measured NAD+ and NADH in three common buffers over 43 days at 19 and 25 °C. Both were highly stable in Tris buffer, while sodium phosphate and HEPES gave faster degradation of NADH, and a modest rise in temperature made a significant difference to long-term stability. The practical lesson for any NAD+ solution is that formulation and cold storage matter.
Where Celyfe fits
The Celyfe NAD+ Precision Pen holds 500mg of NAD+ in a pre-filled 3ml cartridge, a concentration of 166.7mg per ml. The certificate for batch A26085, from the independent laboratory Analiza Bialek (Wroclaw, Poland), tested by HPLC and dated 2 October 2026, reports 99% purity and is in the COA library at /coa. The pen is shipped cold-chain and tracked, dispatched within 1 to 2 working days, and stored at 2 to 8 °C (do not freeze). See /products/nad-precision-pen.
Sources
- PubChem (National Library of Medicine). Nicotinamide adenine dinucleotide, CID 5892: formula C21H27N7O14P2, 663.4 g/mol. NADH, CID 439153.
- Covarrubias AJ, Perrone R, Grozio A, Verdin E. NAD+ metabolism and its roles in cellular processes during ageing. Nature Reviews Molecular Cell Biology, February 2021. PMID 33353981.
- Lowry OH, Passonneau JV, Rock MK. The stability of pyridine nucleotides. Journal of Biological Chemistry, October 1961. PMID 14466980.
- Wolfe KD, Alahuhta M, Himmel ME et al. Long-Term Stability of Nicotinamide Cofactors in Common Aqueous Buffers: Implications for Cell-Free Biocatalysis. Molecules, November 2024. PMID 39598842.
Research use only
Celyfe supplies research peptides for laboratory and research use only. Nothing on this page is guidance on use in humans or animals.
Research updates
Peptide research and testing, in your inbox
New batch certificates, regulation changes and a monthly digest of new published research on the compounds we cover. No spam, unsubscribe at any time.