Because NAD+ is a defined small molecule rather than a synthesized peptide chain, evaluating a supplier means asking a slightly different set of questions than you would for the rest of this catalog — but the underlying principle is identical: don't take a vial's contents on faith. NAD+'s growing presence in metabolic and aging-adjacent research has also brought a wider range of sellers into the market, which makes documentation-first evaluation more useful now than it might have been when the coenzyme was a niche biochemistry-lab reagent.
What "verified" should mean for NAD+
A credible supplier documents purity with a real, method-attributed number — typically HPLC-based — rather than a bare percentage on a label. See HPLC purity analysis for what that number actually represents and how it's generated.
Identity, not just purity
Purity alone doesn't confirm you're holding NAD+ rather than a related nucleotide or a degradation product. Look for suppliers whose documentation reflects mass-based identity confirmation alongside chromatography, not chromatography alone.
Batch-specific documentation
A certificate of analysis tied to the exact lot in your vial is worth far more than a generic specification sheet reused across every batch a supplier has ever sold. See how to read a COA for what a legitimate one includes.
Independent confirmation
Where a supplier offers independent, third-party test results alongside its own internal data, that's a meaningful signal that the purity claim on the label isn't just marketing copy.
Handling that matches the chemistry
NAD+ is more chemically sensitive in solution than many research compounds, so honest reconstitution and storage guidance — not generic boilerplate — is itself a marker of a supplier that understands what it's selling.
Shipping conditions
Because heat accelerates hydrolysis of the intact dinucleotide, how a supplier ships lyophilized NAD+ is worth checking before ordering. Packaging that accounts for transit time and seasonal temperature swings, rather than a one-size-fits-all shipping method, reduces the chance that a vial arrives already partially degraded.
What to look for on the label
- Defined identity — the intact dinucleotide, molecular formula C21H27N7O14P2, not an ambiguous "NAD" blend.
- Measured purity with the analytical method named.
- Lot-specific COA shipped with, or available for, the exact vial received.
- Clear research-use-only labeling, with no suggestion of human or animal use.
- Cold-chain-appropriate, discreet shipping.
Where V8 Peptides fits
V8 Peptides supplies NAD+ as a lyophilized powder verified to high HPLC purity, with a batch-specific certificate of analysis issued for every vial and domestic shipping via USPS. The product listing is here: 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.