NAD+ supplement labels rarely say "NAD+" at all. They list names like nicotinamide riboside, NR, nicotinamide mononucleotide or NMN, and each name has its own rules. This guide explains what those names mean and what to check on the panel.
What NAD+ is, and why labels use other names
NAD+ is short for nicotinamide adenine dinucleotide. It is a coenzyme, which is a helper molecule that cells use in chemical reactions. It is made in the body from smaller building blocks.
Supplement makers do not usually put NAD+ itself in a capsule. They use one of those building blocks and name it on the label. In FDA's own wording, nicotinamide riboside is a precursor of the coenzyme and a source of vitamin B3. A precursor is simply an earlier step in the chain.
So when you see "NAD+" on the front of a bottle, look at the back. The Supplement Facts panel names what is really inside.
Sources: FDA, Agency Response Letter, GRAS Notice No. GRN 000635 (August 3, 2016).
NR: nicotinamide riboside
NR is the name for nicotinamide riboside. The form sold as an ingredient is nicotinamide riboside chloride. Its maker, ChromaDex, sent FDA a GRAS notice in March 2016. GRAS means "generally recognized as safe," and it is a food ingredient pathway, not a supplement approval.
FDA answered on August 3, 2016. Its letter says the notice was about NR used as a source of vitamin B3 in vitamin waters, protein shakes, nutrition bars, gum, chews and powdered beverages, at a top level of 0.0057 percent by weight as consumed. The notice was not about every product that carries the name.
The letter also says FDA did not decide whether the dietary supplement rules apply to foods that contain NR. That is a narrow scope. A GRAS letter for a food use does not turn every NR capsule into a reviewed product.
The same letter describes the ingredient as a water-soluble, off-white powder with at least 95 percent NR. It lists purity limits and caps for heavy metals such as arsenic, mercury and lead. Those are specifications the maker gave FDA. They are a reminder that a buyer can ask a brand for a certificate of analysis, a lab report for the lot.
Sources: FDA, Agency Response Letter, GRAS Notice No. GRN 000635 (August 3, 2016).
NMN: nicotinamide mononucleotide
NMN stands for nicotinamide mononucleotide. It is a different molecule from NR, and its status in the United States changed in late 2022.
FDA had reviewed several new dietary ingredient notifications for NMN between 2020 and 2022. Then, in a letter dated November 4, 2022, an FDA official wrote that NMN is excluded from the dietary supplement definition. The letter cited 21 U.S.C. 321(ff)(3)(B)(ii) and said NMN "may not be marketed as or in a dietary supplement."
FDA's reasoning was this. The law leaves out an article that was authorized for study as a new drug, and whose clinical studies were made public, before it was sold as a supplement. FDA said NMN met that test. An FDA spokesperson tied the drug study to a compound called MIB-626.
The ruling was a turn for the market, because FDA had acknowledged one firm's NMN notification, from SyncoZymes, on May 16, 2022 without objection. Read that as a reason for care. If a label lists NMN, it is fair to ask how the seller reads FDA's letter.
Sources: SupplySide Supplement Journal, “FDA says ingredient studied as drug, β-NMN, is excluded from supplements” (November 10, 2022).
How the Supplement Facts panel lists these ingredients
FDA's labeling guide explains how the panel handles ingredients that have no Daily Value. It calls them "other dietary ingredients." The maker must list each one by its common or usual name, with the amount by weight per serving. A symbol points to a footnote that says "Daily Value Not Established."
That means an NR or NMN line should show a name and a weight in milligrams. A line with a name and no amount is a red flag. The panel may also show the source of an ingredient, and a maker may list its constituents indented below it.
Vitamin B3 is different, because niacin has a Daily Value and sits in the fixed vitamin order on the panel. A bottle that names NR as a source of vitamin B3 can be read against that listing.
Sources: FDA, Dietary Supplement Labeling Guide, Chapter IV, Nutrition Labeling.
Proprietary blends and other traps
Some NAD+ products mix several ingredients under a made-up name. FDA's guide says a blend must be called "Proprietary Blend" or a descriptive or fanciful name. The total weight of the blend goes on that line. The ingredients are listed underneath in descending order by weight.
The trap is that a blend shows only the total. If a blend of 300 mg lists NR first, you know NR is the largest part, but not how much. Single-ingredient lines are easier to compare.
Watch for three other things. First, a front label that says "NAD+ booster" while the panel lists something else. Second, a salt form such as "chloride" that is left off. Third, an amount given in a unit you cannot compare, such as capsules instead of milligrams.
Sources: FDA, Dietary Supplement Labeling Guide, Chapter IV, Nutrition Labeling.
A short checklist for reading the panel
- Find the exact ingredient name: nicotinamide riboside, nicotinamide mononucleotide or another form.
- Check the amount in milligrams per serving, and the serving size above it.
- Look for a "Daily Value Not Established" footnote on lines without a Daily Value.
- Be wary of blends that hide the split between ingredients.
- Ask the brand for a certificate of analysis for your lot.
- If a label names NMN, ask the seller how it reads FDA's November 2022 letter.
This article describes how labels work. It does not say what any ingredient does in the body, and it is not medical advice. A doctor or pharmacist is the right person to ask about a specific product.
Sources: FDA, Agency Response Letter, GRAS Notice No. GRN 000635; FDA, Dietary Supplement Labeling Guide, Chapter IV, Nutrition Labeling; SupplySide Supplement Journal, November 10, 2022.