NAD, NMN, Resveratrol and Longevity Claims: What Humans Show

The key idea: three different kinds of evidence

Longevity claims often mix up three things:

1. Preclinical (animal or lab only): something extended the life of mice or changed cells in a dish.
2. A biomarker in people: a blood level or test result changed, such as NAD+ in the blood.
3. A human outcome: people lived longer, stayed independent longer, or had fewer falls, fractures or diseases.

A change in a biomarker is not the same as a longer or healthier life. This page keeps the three apart. Evidence labels: established recommendation, promising but limited, mixed, insufficient evidence, preclinical (animal or lab only). For the broader specialty topic, see Longevity.

NIA says ads for supplements sometimes promise to help you live longer, and that there is often little, if any, science supporting these claims. [1]

Claim check

NAD+, NMN and nicotinamide riboside

• A randomized trial in 80 healthy middle-aged adults (60 days of NMN or placebo) found higher blood NAD and longer walking distance in a six-minute test than placebo, and a general health survey score that was better than placebo; a "blood biological age" calculator score rose in the placebo group and stayed unchanged in the NMN groups. Doses of 300, 600 and 900 mg a day were tested (study amounts, not recommendations), and several authors were employees of companies in the field. [2]
• A randomized trial in 60 older adults (250 mg a day of NMN for 12 weeks) found no significant difference in the primary stepping test, but a shorter 4-meter walking time and better sleep questionnaire scores in the NMN group; the authors were employees of Meiji Holdings. [13]
• A crossover trial of nicotinamide riboside in middle-aged and older adults found it was well tolerated and raised NAD+; the authors suggested later trials should look at blood pressure and arterial stiffness. [3]
• In older adults with mild cognitive impairment, a 10-week trial of nicotinamide riboside raised blood NAD+ 2.6-fold, but cognition scores did not change; the authors said a larger, longer trial is needed. The study product was supplied by a company, and one co-author holds related intellectual property. [14]

What this adds up to: NAD+ in the blood can be raised, and the products were well tolerated in these short trials. Promising but limited for walking and sleep in two NMN trials, insufficient evidence that it slows aging or prevents disease. Proper evidence not found among the sources checked for any trial showing that NMN or nicotinamide riboside extends human lifespan or prevents falls, fractures or dementia.

Resveratrol

Resveratrol is a plant compound. In a mouse study, rapamycin extended life but resveratrol and simvastatin did not significantly affect survival. [4] In people, a meta-analysis found improvements in endothelial (blood-vessel lining) markers, a biomarker finding; the authors say it could matter especially for people with cardiovascular disease. [5]

Senolytics, rapamycin and metformin are drugs

Dasatinib, rapamycin and metformin are prescription medicines. The studies above are research, not a basis for self-treatment. In the 60-woman senolytic trial, no serious adverse events were observed, but the primary endpoint did not differ from control. [7] An older-adult rapamycin pilot (25 people) found reductions in several red blood cell measures in the treatment group. [15] The 48-week PEARL trial found adverse events were similar across groups, and its authors are employees and shareholders of the company that ran it. [10] Metformin's effect on muscle in the trial above is a reminder that a drug with an "anti-aging" reputation can have downsides. [11] Proper evidence not found among the sources read for any of these drugs extending healthy lifespan in people.

Biological-age and "anti-aging" tests

Experts in the Biomarkers of Aging Consortium surveyed barriers and said clinical translation remains limited, recommending that biomarkers be linked to clinically actionable insights and validated as robust and responsive in individuals. [12]

Safety and professional care

• Talk with a doctor or pharmacist before any supplement if you take prescription drugs; see medication interactions and older adults.
• Supplements are not tested like drugs; see how supplements are regulated and evaluating safety claims.
• Proven basics for healthy aging are in maintaining independence as you age and supplements for healthy aging.

When to get help

Stop a product and call your provider if you have a reaction, and tell them about everything you take. [16]