NAD supplements: NMN, NR and other precursors compared

A NAD supplement, in the way shops use the words, is often not NAD. It is a precursor: NMN, nicotinamide riboside, or plain nicotinamide, which is a form of vitamin B3. Sometimes it is an oral NAD or NADH product with a thinner public trial file than the marketing. This page compares categories. It does not score brands.

Three precursors, one coenzyme

NAD is the coenzyme. Nicotinamide is a vitamin form the body already uses to make it. Nicotinamide riboside and NMN are larger precursors that have been given as supplements in trials. EFSA's 2026 opinion on one synthetic NMN says that ingredient is a bioavailable source of nicotinamide, with 300 mg of that NMN corresponding to about 109.7 mg of nicotinamide. That is a conversion inside a European safety assessment, not a US dosing chart. The same opinion excluded pregnant and lactating women.

Nicotinamide riboside chloride is an authorized novel food in Great Britain, up to 300 mg a day for adults in general and 230 mg a day for pregnant and lactating women, under the FSA record NOVEL-96. That authorization is not a finding that the ingredient extends life. It is a food authorization with a maximum. The United States regulates it as a dietary ingredient under supplement law, not under the British novel-food list. Readers meet '300 mg' on both NMN and NR labels as if the number meant the same thing. It does not. EFSA's 300 mg NMN figure and the FSA's 300 mg NR chloride figure are different molecules.

What the trials report

For NMN, Yoshino's 250 mg, 10-week trial in 25 postmenopausal women with prediabetes found a rise in muscle insulin sensitivity of about 25 percent versus baseline, not seen after placebo, and no change in body composition. Yi's 60-day trial in 80 healthy middle-aged adults found higher blood NAD at 300, 600 and 900 mg, a walk-distance change, and no HOMA-IR difference versus placebo at day 60. No result is stated here for oral NAD, NADH, liposomal NAD, patches or peptides.

Nicotinamide itself is vitamin B3. Niacin and nicotinamide have authorized nutrient claims in places that use the European register, such as energy metabolism, and they also have a flushing story that belongs to nicotinic acid more than to nicotinamide. We are not re-reviewing the vitamin. We are saying that a NAD-precursor advert which implies a longevity effect has to stand on the precursor's own trials, not on the fact that vitamin B3 exists.

Claims, kept inside the law

US supplements may use structure/function claims with the FDA disclaimer. They may not claim to treat diabetes, infertility, Alzheimer's disease or aging as a disease. The FDA's September 2025 decision lets NMN stay inside the supplement definition. It does not authorise a disease claim, and it does not remove the new-dietary-ingredient notification duty described in the petition response. The FTC still wants evidence that matches the claim. 'Raises NAD in a blood test in one 60-day trial' is a narrower sentence than 'anti-aging'.

A comparison that is not a ranking

• NMN: the human trials used 250 mg for 10 weeks or 300 to 900 mg for 60 days. FDA, September 29, 2025: not excluded from the supplement definition. NDIN still matters.
• Nicotinamide riboside chloride: authorized as a novel food in Great Britain with daily maximums of 300 mg or 230 mg. That is not a US trial result and not an efficacy claim.
• Nicotinamide: a form of vitamin B3, a known NAD precursor, with nutrient claims that are not longevity claims.
• Oral NAD or NADH: not given a mirrored results paragraph.
• Injections and IV drips: not oral supplements, and not covered on this page.

Pregnancy, breastfeeding and cancer treatment are reasons to talk to a clinician before any precursor. EFSA kept pregnant and lactating women out of the NMN use it assessed. Call 911 in an emergency. A shopper comparing bottles should also separate the daily amount on the label from the molecule. Three hundred milligrams of nicotinamide riboside chloride is the British food maximum in the FSA record, not a finding that 300 mg of NMN does the same job, and not a US recommended intake. Three hundred milligrams of NMN was one arm of Yi's trial and the top of the use EFSA assessed for one synthetic material. Niacinamide, or nicotinamide, is sold in much smaller vitamin doses and also in high-strength tablets that bring their own tolerability questions. Liposomal NAD, patches and peptides are outside this comparison. If a label says NAD complex and the Supplement Facts panel lists more than one precursor, you are not looking at Yoshino's capsule or Yi's capsule. Count each precursor on its own line. Ignore a front-of-pack word until it matches a line. A disease claim is still outside what a supplement may say, whichever precursor is in the bottle. This page compares categories of evidence. It does not pick a winner. A reader still has to match the molecule on the Supplement Facts panel to the molecule in the trial, and then ask a clinician before starting. Nicotinamide riboside chloride's British maximum is a legal ceiling for that ingredient in Great Britain, 300 mg is not a universal NAD dose. NMN's trial amounts are protocols. Niacin's recommended intake is a vitamin figure from a different fact sheet. Those three figures are not one number. The FDA disclaimer is a legal label, not evidence. The evidence is the trial, the population, and the outcome that did not change. A bundle name does not turn them into one promise of youth. Yoshino studied 25 postmenopausal women with prediabetes for 10 weeks at 250 mg. Yi studied 80 healthy middle-aged adults for 60 days at 300, 600 or 900 mg. EFSA assessed one synthetic NMN at up to 300 mg a day and kept pregnancy and breastfeeding out. The FSA record NOVEL-96 authorises nicotinamide riboside chloride, not NMN, at up to 300 mg or 230 mg a day. The FDA letter of December 2, 2025 says NMN is not excluded from the US dietary-supplement definition. That letter is not a disease claim and not a dose. Call 911 in an emergency. A clinician licensed in your state can look at other medicines. Call 911 in an emergency. A clinician licensed in your state is the person who can look at the other medicines you take. Nothing on this page is a personal dose or a ranking of bottles. Match the molecule on the label to the molecule in the trial before you compare amounts. Ask a clinician first.