What NAD+ treatment has shown
NAD+ can rise while strength and lasting safety remain unproved
A walk that needs more rests may make a pill sound worth trying. Some NAD+ studies found better walking, but none showed that people became younger.
Blood changes leave the question of strength open
Needing a rest on your usual walk leaves the value of a supplement unsettled. Your body makes NAD+, a substance needed to get energy from meals.
Your body consists of cells, living parts so small your eyes cannot see each one. Animal studies found falling NAD+ with age, while far less research has checked older people.
Pills bearing the name “NAD” may hold NMN or NR instead, ingredients your body changes into NAD+. Little swallowed NAD+ reaches cells before breaking into smaller parts, so most pill trials test those ingredients instead.
NAD+ takes part in getting energy and repairing damage
A review describes the need for NAD+ as cells get usable energy from meals [5]. That work happens with NAD+ your body makes, whether or not you take a supplement.
The review also describes proteins, substances that do many jobs inside cells, using NAD+ during repairs [5]. These jobs include mending DNA, the instructions within cells, and controlling inflammation, which can bring swelling after injury.
The 2021 review brought together findings of lower NAD+ with age in yeast, worms, mice, and people [5]. The review didn't test whether taking extra NAD+ improved strength in older people.
The same review explains that meals supply material for NAD+, while cells reuse nicotinamide, a B vitamin [5]. Most fresh NAD+ comes from reusing nicotinamide after older NAD+ breaks apart.
A peptide or protein consists of chains made from amino acids, small parts joined together; NAD+ is built differently. Their make-up differs, so a claim about one substance doesn't apply to the others.
Does needing NAD+ mean extra would make you stronger? The explanation here describes daily needs, which don't by themselves establish a benefit from supplements.
NAD+ pill labels can hide which ingredient was tested
The word “NAD” on a bottle may leave the actual pill ingredient unclear. For you, a study is useful only when the treatment studied matches the treatment being offered.
The FDA has approved no use of NAD+ for treating disease [6]. When swallowed, very little NAD+ gets into cells before breaking into smaller parts.
Most trials give pills containing NR or NMN to supply cells with material for fresh NAD+ [6]. Niacin and nicotinamide, forms of vitamin B3, also supply material the body needs for NAD+.
Adults in good health apart from being overweight received NR in an eight-week study [4]. Blood NAD+ rose by 22% with 100 milligrams daily and by 51% with 300 milligrams daily.
The rise reached 142% at 1000 milligrams daily; the measured change concerned blood, rather than better health. A different trial gave NMN at 300-900 milligrams daily for 60 days [3].
On day 30 and day 60, each group given NMN had a rise in blood NAD+. The two pill ingredients differ from NAD+ itself; neither trial tested the benefit of swallowing NAD+.
Walking and sugar tests changed; other findings came from mice
Middle-aged people taking NMN walked farther during a six-minute test after 60 days, alongside a rise in their blood NAD+ [3]. The authors judged 600 milligrams daily best for those results, with no safety problem reported.
That choice described the trial, rather than an amount chosen for your treatment. The findings don't settle which amount would be best for your health.
Women after menopause, when periods had ended, had blood sugar above normal and took NMN at 250 milligrams daily for 10 weeks [1]. Their muscles took sugar from blood more readily when given insulin, a hormone that controls blood sugar.
A blood test covering sugar levels over recent months stayed unchanged; the amounts of muscle and fat also remained the same. Strength wasn't tested, so the better response to insulin doesn't show that the women grew stronger.
In a separate trial, NR raised blood NAD+, and the people had no hot, red skin as a side effect [4]. That result concerns blood tests and skin symptoms, rather than walking or strength.
In mice, NMN and NR improved blood sugar control and reduced liver fat [6]. Those results don't establish that either pill would help your blood sugar.
Other mouse studies examined reproduction: older females given NMN had healthier eggs and signs of more eggs remaining [9][10]. Cells in the mice's ovaries, the organs holding eggs, also produced energy better; those findings don't address men's strength or safety.
A 2025 review judged the evidence for human health gains limited; most NAD+ measurements came from blood [13]. The stronger aging findings concern animals, leaving lasting benefit and safety for you unsettled.
Matching a claim to the study helps you ask better questions
If a pill promises renewed strength, the aging research explains what was studied in people and animals. The pill ingredient page helps you tell NMN, NR, and NAD+ apart.
The treatment studies cover walking tests, blood sugar, shots, and drips, with the results kept distinct. The amounts tested describe the treatments given; nobody here has examined you or chosen your care.
The questions and answers address unwanted effects, weight, and claims about younger looks. The numbered papers beside each finding show who received treatment, so a result in mice isn't mistaken for human evidence.