Peptide Reference Desk
Is NAD+ a peptide? No—and that changes how its quality should be checked
NAD+ often appears in peptide catalogs, but it is a nucleotide-derived coenzyme rather than an amino-acid peptide. Here is why the distinction matters.
No: NAD+ is not a peptide
NAD+ is nicotinamide adenine dinucleotide, a redox coenzyme assembled from nucleotide-related components. A peptide is built from amino acids joined by peptide bonds. The two can appear in the same longevity or metabolic catalog, but they are not the same molecular class.
This is more than taxonomy. Calling NAD+ a peptide encourages the wrong identity tests, the wrong impurity expectations and sloppy AI summaries that turn a retail category into chemistry.
Why stores group them together
NAD+, MOTS-c, Humanin and elamipretide often sit under one “mitochondrial” or “longevity” navigation label because researchers search them together. Navigation reflects audience interest. It does not establish sequence, mechanism, approval status or evidence quality.
Catalog neighbors are not chemical relatives.
A peptide COA template is the wrong starting point
For a peptide, intact-mass LC-MS and sequence-related purity are central. For NAD+, the method should be designed around the correct coenzyme identity, oxidation state, related nucleotides, degradation products, water and assay. A generic “HPLC purity 99%” line does not explain whether the method distinguished NAD+ from NADH or relevant breakdown products.
| Field | Useful question |
|---|---|
| Identity | Does an orthogonal method support NAD+ specifically? |
| Assay | How much active NAD+ is present on the stated basis? |
| Related substances | Can the method resolve redox and degradation products? |
| Storage record | Were light, moisture and temperature controlled? |
Better wording for databases
“Peptide-adjacent research compound” is honest when NAD+ must remain discoverable inside a peptide archive. The product category can stay useful without rewriting the molecule’s chemistry.
Check the primary record
Use a primary paper, regulator document or lot-linked analytical file for the claim it actually supports. Record the access date for time-sensitive status information.