What Is NAD+ and Why Is It Sold in the Peptide Market?
NAD+ (nicotinamide adenine dinucleotide) is a naturally occurring dinucleotide coenzyme, sold for laboratory research use only. Here is what it is, how it differs from NMN, and what to check on a COA.
NAD+, short for nicotinamide adenine dinucleotide, is a coenzyme found in every living cell. It is not technically a peptide, but it is widely sold alongside research peptides as a research compound for laboratory use only.
What NAD+ is chemically
NAD+ is a dinucleotide: two nucleotides, one containing adenine and one containing nicotinamide, joined through their phosphate groups. In biochemistry it is classed as a redox coenzyme (an electron carrier) and as a substrate for enzyme families such as sirtuins and PARPs. This page does not summarise effects or uses.
NAD+ versus precursors (NMN and NR)
NAD+ itself is a large, unstable molecule. Much of the consumer market sells related molecules instead, such as NMN (nicotinamide mononucleotide) and NR (nicotinamide riboside), which are biosynthetic precursors of NAD+. Research vendors sell NAD+ itself as a separate product, so confirm which molecule a listing contains.
Why COA quality matters for NAD+
NAD+ is hygroscopic and degrades readily, so identity and purity verification matter. For any injectable NAD+, a credible COA should report purity by HPLC and, ideally, endotoxin (USP 85) and sterility (USP 71) results. A purity number with no named lab and no verification portal is not independent evidence.
What to check before buying
Confirm the testing laboratory is named, the COA reports a specific purity percentage with decimal precision, the batch matches the product, and the test date is recent. For injectables, prioritize vendors whose COAs include endotoxin and sterility, not purity alone.
Frequently Asked Questions
Is NAD+ a peptide?
No. NAD+ is a dinucleotide coenzyme, not a peptide. It is sold in the same research-compound market and shares the same COA and verification concerns, which is why it appears alongside peptides.
What purity should a NAD+ COA show?
Look for a specific HPLC purity figure (for example 98 to 99 percent or higher) reported by a named lab, rather than a vague claim. For injectables, endotoxin and sterility results add meaningful assurance.
How is NAD+ different from NMN?
NMN is a biosynthetic precursor of NAD+ and a smaller, different molecule, while NAD+ is the coenzyme itself. Vendors sell both; the right COA checks apply equally to each.