Oral Nicotinamidribosid (NR) und Nicotinamidmononukleotid (NMN) tun zuverlässig eine Sache: Eingenommen per Mund, erhöhen sie das NAD+ im Blut dosisabhängig in mehreren randomisierten Studien. Ob dieser erhöhte Marker sich darauf auswirkt, wie sich eine Person fühlt, leistungsfähig ist oder altert, ist unklar. Die menschlichen Studien zu Muskelkraft, Glukosekontrolle und Alterungsmarkern fallen meist klein, gemischt oder null aus, selbst dort, wo dieselben Verbindungen bei alten Mäusen bemerkenswerte Effekte zeigen.
Die Erhöhung von NAD+ ist also belegt; dass die Auffüllung davon die menschliche Gesundheits- oder Lebensspanne verlängert, ist es nicht. Diese Seite ordnet jede Behauptung so ein, wie es der Beweislage entspricht, behandelt den FDA-Status von NMN und die Sicherheitsbilanz bei kurzfristiger Anwendung und erklärt, wie sich eine tägliche Kapsel von einer intravenösen NAD+-Infusion unterscheidet.
Findings & Outcomes
What It Is
NAD+ (nicotinamide adenine dinucleotide) is a coenzyme every cell uses to turn food into usable energy and to run its repair and signaling enzymes. Its level drifts down with age across many tissues, and that decline is the rationale behind the whole precursor category. NMN and NR are two precursor molecules the body converts into NAD+, sold as capsules or powder to top the pool back up. Both are relatives of vitamin B3, and NR and NMN raise NAD+ more than an ordinary diet does.
How It Works
Built from vitamin B3, NAD+ powers the enzymes of energy metabolism and feeds repair systems such as the sirtuins and the PARPs. Two of those steps are settled: NAD+ falls with age, and the precursors raise it back up.
Anatomy of the Practice
1The rationale: NAD+ falls with age
NAD+ is central to energy metabolism and cellular repair, and its levels decline with age in many tissues. That decline is why the precursor category exists: the hope is that restoring NAD+ toward a younger level restores some of what falls with it. The decline itself is well described.
2What the precursors do in the blood
Taken by mouth, NR and NMN are absorbed and converted into NAD+, and human trials consistently measure a rise in blood NAD+ and its metabolites within weeks. This is the dependable, replicated part. The marker rises, and it rises in a dose-related way, a pharmacological effect that is not in dispute.
3From a marker to an outcome
In the human trials blood NAD+ rose while strength, insulin sensitivity, and aging markers stayed where they were. A higher number on a lab report is one thing. Whether the extra NAD+ reaches the tissues that matter and does useful work there is what the functional trials must settle, and so far they mostly have not.
An intravenous NAD+ drip delivers NAD+ by a different route but runs into the same limit, and it rests on even less controlled outcome evidence than the oral capsules. For where NAD+ decline sits among the drivers of aging, see the biology of aging; for the cell structures it helps power, see the mitochondria.
What It Does
People buy a daily capsule on a simple chain: the level drops with age, precursors lift it, so lifting it should slow aging. That chain rests on animal work, and the animal work is the strong part. In aged mice, restoring NAD+ improves metabolism, muscle, and healthspan, and the field holds some of the more reproducible results in aging biology.
The human evidence sorts into tiers, strongest first. Firmest is the raised NAD+ level itself. The weak point is the payoff people pay for: added up, the precursors have not moved glucose, lipids, or muscle strength in ordinary adults over 60. Between that firm marker and those null results sit two preliminary leads in narrow groups. Above everything sits the headline claim with no completed human trial behind it, that a precursor extends healthspan or lifespan.
The weak point is the payoff people pay for: added up, the precursors have not moved glucose, lipids, or muscle strength in ordinary adults over 60.
The Research & Studies
Everything here is based on the research we have collected and checked, sorted into groups and ordered with the strongest evidence first. Click any claim to open the studies behind it.
How it works
Orales NR und NMN erhöhen zuverlässig Blut-NAD+, dosisabhängig (NMN getestet bei 300 bis 900 mg pro Tag)
Die orale Einnahme von NR oder NMN erhöht zuverlässig den NAD+-Spiegel im Blut. Dies ist der einzige Effekt, über den die Humanevidenz gesichert ist.
In einer 2×6-wöchigen randomisierten doppelblinden Crossover-Studie (Martens et al. 2018, Nat Commun) wurde eine chronische NR-Supplementierung bei gesunden mittel- und älteren Erwachsenen gut vertragen und stimulierte effektiv den NAD+-Stoffwechsel. First-in-human-Pharmakokinetik (Trammell et al. 2016, Nat Commun) zeigte, dass einzelne orale NR-Dosen das Blut-NAD+-Metabolom dosisabhängig erhöhten. Eine dosiseskalierte NMN-Studie (Yi et al. 2023, GeroScience) fand, dass Blut-NAD+ bei 300, 600 und 900 mg/Tag gegenüber Placebo und Ausgangswert signifikant anstieg, am höchsten bei den beiden höheren Dosen.
Who this may not transfer to:The rise in blood NAD+ is measured in both sexes across NR and NMN trials; it is a pharmacodynamic marker, so it does not by itself transfer to any clinical benefit.
The studies · 3
Martens et al. 2018, Nat Commun (NR elevates NAD+ in middle-aged and older adults) · Nat Commun
Trammell et al. 2016, Nat Commun (NR orally bioavailable in mice and humans) · Nat Commun
Yi et al. 2023, GeroScience (dose-dependent NMN trial) · GeroScience
NAD+ sinkt mit dem Alter, die Grundlage für die Supplementierung, obwohl nicht gezeigt wurde, dass eine Wiederherstellung das Altern umkehrt
NAD+ neigt dazu, mit zunehmendem Alter zu sinken, was der Grund ist, warum Menschen Vorstufen zur Auffüllung einnehmen. Der Rückgang ist gut beschrieben; ob seine Umkehrung hilft, ist eine separate Frage.
Übersichtsarbeiten zur NAD+-Biologie (Lautrup et al. 2019, Cell Metab) beschreiben einen altersbedingten Rückgang von NAD+ in verschiedenen Geweben, mit nachgelagerten Effekten auf Sirtuin- und PARP-Aktivität, DNA-Reparatur und Mitochondrienfunktion. Dieser Rückgang ist die mechanistische Grundlage für die Verwendung von NAD+-Vorstufen; die Übersichtsarbeit betrachtet die Wiederherstellung als zu testende Hypothese, nicht als etablierte Anti-Aging-Intervention.
Who this may not transfer to:The age-related NAD+ decline is described across tissues in both sexes; it is a biological rationale, not a population outcome.
The study · 1
Lautrup et al. 2019, Cell Metab (NAD+ in brain aging and neurodegeneration) · Cell Metab
Blood Sugar
In der Zusammenschau von 8 Studien mit 342 Erwachsenen veränderte NMN weder Glukose, Insulin, HbA1c noch Lipide
Werden alle NMN-Studien zusammengerechnet, senkte es im Durchschnitt weder Blutzucker, Insulin noch Cholesterin. Der allgemeine Stoffwechselnutzen, den Menschen erwarten, zeigte sich nicht.
Eine systematische Übersichtsarbeit mit Metaanalyse (Chen et al. 2024, Curr Diab Rep) fasste acht RCTs mit insgesamt 342 mittel- und älteren Erwachsenen zusammen, 49 % weiblich und überwiegend nicht-diabetisch, mit NMN-Dosen von 250 bis 2000 mg/Tag über 14 Tage bis 12 Wochen. Random-Effects-Metaanalysen fanden keinen signifikanten Nutzen für Nüchternglukose, Nüchterninsulin, glykiertes Hämoglobin, HOMA-IR oder das Lipidprofil.
Who this may not transfer to:The pooled null was in mostly non-diabetic middle-aged and older adults of both sexes, so it does not rule out an effect in metabolically impaired groups.
The study · 1
Chen et al. 2024, Curr Diab Rep (NMN on glucose and lipid metabolism meta-analysis) · Curr Diab Rep
NMN 250 mg täglich über 10 Wochen erhöhte die Muskelinsulinsensitivität bei 25 postmenopausalen Frauen mit Prädiabetes
Bei postmenopausalen Frauen mit Prädiabetes verbesserten zehn Wochen NMN das Ansprechen der Muskeln auf Insulin. Es handelt sich um eine kleine Studie in einer spezifischen Gruppe.
Eine 10-wöchige randomisierte doppelblinde placebokontrollierte Studie (Yoshino et al. 2021, Science; n=25) bei übergewichtigen oder adipösen postmenopausalen Frauen mit Prädiabetes ergab, dass NMN 250 mg/Tag die mittels Klemme gemessene insulinstimulierte Glukoseaufnahme erhöhte, die AKT- und mTOR-Phosphorylierung im Muskel steigerte und Muskelumbauzene hochregulierte. Körpergewicht, andere Stoffwechselmaße und zirkulierende Marker blieben weitgehend unverändert.
Who this may not transfer to:The trial enrolled only postmenopausal women with prediabetes; whether the muscle insulin-sensitivity effect transfers to men, to premenopausal women or to metabolically healthy people has not been tested.
The study · 1
Yoshino et al. 2021, Science (NMN increases muscle insulin sensitivity in prediabetic women) · Science
Muscle And Strength
Weder NMN noch NR verbesserten Muskelmasse, Griffstärke oder Ganggeschwindigkeit bei Erwachsenen über 60 Jahren
Werden die Studien zusammengerechnet, verbesserten NMN und NR bei älteren Erwachsenen weder die Muskelgröße, die Griffstärke noch die Gehgeschwindigkeit. Die Kraft- und Funktionsaussagen hielten einer Überprüfung nicht stand.
Eine systematische Übersichtsarbeit und Meta-Analyse (Prokopidis et al. 2025, J Cachexia Sarcopenia Muscle) von RCTs bei Erwachsenen mit einem mittleren Alter von 60.9 bis 83 Jahren fand, dass NMN keinen signifikanten Effekt auf den Skelettmuskelindex, die Handgriffstärke, die Gehgeschwindigkeit oder den Fünfmal-Aufsteh-Test hatte, und die narrative Synthese zeigte keinen Nutzen für Kniestreckstärke, SPPB oder Oberschenkelmuskel-Masse. NR war nur bei Menschen mit peripherer arterieller Erkrankung mit einem längeren Sechs-Minuten-Gehtest verbunden. Die Autoren schlussfolgerten, dass aktuelle Evidenz NMN oder NR zum Erhalt von Muskelmasse und -funktion nicht unterstützt.
Who this may not transfer to:The null applies to older adults of both sexes with mean age over 60; it does not address younger or athletic people.
The study · 1
Prokopidis et al. 2025, J Cachexia Sarcopenia Muscle (NMN and NR on muscle mass and function meta-analysis) · J Cachexia Sarcopenia Muscle
Counts once: this finding and 1 other here come from the same source, so they are one body of evidence, not separate confirmations.
Longevity And Mortality
Keine menschliche Studie hat gezeigt, dass NAD+-Vorstufen die Gesundheitsspanne oder Lebensdauer verlängern; die auffälligen Ergebnisse sind bei Tieren
Die auffälligen Lebensdauerergebnisse sind bei Tieren. Beim Menschen hat keine Studie gezeigt, dass diese Vorstufen das Altern verlangsamen oder das Leben verlängern.
Eine systematische Übersichtsarbeit zu NAD+-Vorläuferstudien (Gindri et al. 2024) katalogisierte Ergebnisse über klinische Zustände und identifizierte keine Lebensdauer- oder Alterungs-Endpunkte, und eine Muskel-Meta-Analyse (Prokopidis et al. 2025) fand keinen funktionellen Nutzen bei älteren Erwachsenen. Die Tierliteratur zeigt, dass NAD+-Wiederherstellung die Gesundheitsspanne und für verwandte Interventionen die Lebensdauer verbessert, aber dies hat sich nicht in demonstrierten menschlichen Gesundheitsspannen- oder Lebensdauernutzen übersetzt.
Who this may not transfer to:No human healthspan or lifespan endpoint has been measured in either sex; the extension results are in animals only.
The studies · 2
Gindri et al. 2024, Am J Physiol Endocrinol Metab (safety and effectiveness of NAD systematic review) · Am J Physiol Endocrinol Metab
Prokopidis et al. 2025, J Cachexia Sarcopenia Muscle (NMN and NR on muscle mass and function meta-analysis) · J Cachexia Sarcopenia Muscle
Counts once: this finding and 1 other here come from the same source, so they are one body of evidence, not separate confirmations.
Cardiorespiratory Fitness
NMN 600 bis 1.200 mg täglich hob die submaximale aerobe Kapazität bei 48 Sportlern, während VO2max sich nicht veränderte
Bei Amateursportlern, die weiter trainierten, verbesserten höhere NMN-Dosen ihre submaximale aerobe Kapazität, obwohl sich ihre maximale Kapazität nicht veränderte.
Eine sechswöchige vierarmige randomisierte doppelblinde Studie (Liao et al. 2021, J Int Soc Sports Nutr; n=48, 40 Männer und 8 Frauen) bei freizeitlich trainierten Läufern fand, dass die mittlere (600 mg) und hohe (1.200 mg) NMN-Gruppe die Sauerstoffaufnahme, den VO2max-Prozentsatz und die Leistung an der ersten und zweiten Ventilationsschwelle stärker als Placebo verbesserten. VO2max, O2-Puls, VO2 relativ zur Arbeitsrate und Maximalleistung blieben unverändert. Die Autoren schrieben den Effekt einer verbesserten Sauerstoffverwertung der Skelettmuskulatur zu.
Who this may not transfer to:The trial ran in young and middle-aged recreationally trained runners, only 8 of 48 women, so transfer to untrained or older people is untested.
The study · 1
Liao et al. 2021, J Int Soc Sports Nutr (NMN and aerobic capacity in amateur runners) · J Int Soc Sports Nutr
Getting NAD+ Up, in Order
Ways to Do It
Match what you do to what you want. If the goal is the healthspan the animal work points at, the levers with human evidence are free and come first. If the goal is to raise NAD+ specifically, the precursors do that, though whether the higher level changes how you feel or age is not established. The precursors and any metabolic use are worth talking through with a clinician first.
Exercise and not eating to excess most reliably support NAD+ and mitochondrial health in people. Both carry decades of human healthspan evidence the capsules lack. If slower aging is what draws you to precursors, start here, it is the intervention most likely to actually deliver.
The body makes NAD+ from vitamin B3 in ordinary food: fish, poultry, meat, mushrooms, peanuts, and fortified grains all supply niacin and nicotinamide. Outright NAD+ shortage from diet is uncommon on a mixed diet, so for most people the base of the pool is already covered without any supplement.
Nicotinamide (niacinamide) is a cheap, long-used form of vitamin B3 that also feeds NAD+. It does not raise NAD+ as much as NR or NMN, and it is not sold as anti-aging. If the aim is simply to cover B3 at low cost, it does that, and it has the longest safety record of any form here.
NR is the precursor with the most human pharmacology behind it and a clearer regulatory footing in the United States, where it is an accepted dietary ingredient. Trial doses run around 250 to 1000 mg a day. It raises NAD+ dependably; the functional benefits beyond that are not established.
NMN raises NAD+ as well, and it carries the two most interesting human leads: better insulin sensitivity in postmenopausal prediabetic women, and improved aerobic capacity in runners. Its US regulatory status is unsettled, it sits in a gray zone though it is widely sold. Doses in trials run about 250 to 900 mg a day.
The lone clean positive result came from that same prediabetic group. For a diagnosed metabolic problem, decide it with the clinician tracking your numbers. Diet, movement, and any prescribed medication are what manage it; the pooled trials did not find an average glucose benefit from a precursor.
Go Deeper
- IV therapy and NAD+: the infusion version of the same idea, and how its outcome evidence compares with a daily oral precursor.
- The biology of aging: where NAD+ decline ranks among the drivers of aging, and how to read a marker that can move while the outcome does not.
- Rapamycin: the other longevity frontier with a strong animal record and early human aging data, and the same animal-to-human gap.
- Mitochondria: the cell's power plants that NAD+ helps run, and the reason energy is the mechanism most people have in mind here.
The Chinese Medicine View
NAD+ and its precursors are products of 20th-century biochemistry, isolated and synthesized in a laboratory, so the classical Chinese pharmacopoeia has no entry for them. No historical text assigns NMN or NR a channel, a temperature, or a flavor, and reading one back in would be invention. What the tradition offers instead is a way of thinking about aging and about building the body up.
These precursors target the reserve loss that comes with age. Chinese medicine has always reasoned about that loss, chiefly through the Kidney essence, the deep constitutional reserve it ties to growth, aging, and vitality. The tradition holds this reserve is largely fixed at birth and spent across a lifetime, conserved and supported but not simply refilled from a bottle.
Tonifying, bu, is the family of methods for building up a true deficiency, and its art is judging whether the person has one and can transform what is given. Giving more than the system can use does not build reserve; it stagnates. Yang Sheng, the cultivation of life, rests on moderation, movement, and conserving reserves. In this tradition a tonic is matched to the person, never handed to everyone alike.
Cautions For This Practice
Extra restraintEverything to be aware of is here, in one place. This practice suits most healthy people; a few situations call for real care.
Gut vertragen über Wochen bis Monate bei 489 Personen, mit nur milden Wirkungen; längere Anwendung nicht untersucht
Eine systematische Übersichtsarbeit zu NAD+- und NADH-randomisierten Studien über klinische Zustände (Gindri et al. 2024, Am J Physiol Endocrinol Metab; 10 Studien, 489 Teilnehmer) fand, dass Supplementierung gut vertragen wurde mit niedriger Nebenwirkungsinzidenz, die häufigsten waren Muskelschmerzen, Kopfschmerzen, Müdigkeit und Schlafstörungen, und keine schwerwiegenden Gesundheitsrisiken. Dedizierte Studien zu NR (Martens et al. 2018) und NMN (Yi et al. 2023) berichteten ebenfalls gute Verträglichkeit über ihre Studienzeiträume.Gindri et al. 2024, Am J Physiol Endocrinol Metab (safety and effectiveness of NAD systematic review)Martens et al. 2018, Nat Commun (NR well-tolerated)
The aging payoff is an animal result, so treat anti-aging use as experimental
The lifespan and healthspan gains are a mouse result. Taking NMN or NR to live longer is a self-experiment. Do not let a capsule crowd out the exercise and eating habits with real human healthspan evidence.
Short-term safety looks good, long-term is unstudied
Across the human trials, NR and NMN were well tolerated for weeks to a few months. Effects were mostly mild (nausea, headache, fatigue) with no serious adverse events reported. No trial has run past a few months, so multi-year safety is simply unstudied. Years is the timescale anyone taking them for aging has in mind.
A theoretical concern with cancer, still unresolved
NAD+ fuels the growth and repair machinery of all cells, including cancerous ones. Some laboratory work raises the question of whether pushing NAD+ up could feed an existing tumor. It has not been shown to happen in people and stays theoretical. Still, anyone with a current or recent cancer should clear NAD+ precursors with their oncologist first.
NMN sits in a regulatory gray zone
In the United States the FDA has taken the position that NMN is excluded from the dietary-supplement definition. The reason: it was authorized for study as a drug before it was marketed as a supplement. It is nonetheless widely sold, and enforcement has been inconsistent. This does not make NMN dangerous, but the usual supplement oversight is uncertain.
Kidney or liver disease, pregnancy, and medication overlap
These precursors are processed and cleared by the body like other nutrients, and the trials showing they are tolerated were mostly in reasonably healthy adults. Supplemental doses have not been studied in kidney or liver disease, pregnancy, breastfeeding, or alongside metabolic medication. In any of those cases, clear it with your clinician first.
Buy tested, and keep the dose in the studied range
Supplements are loosely regulated. An independent testing mark such as NSF or Informed Choice is the simplest proof the label matches the contents, it matters most for NMN. Keep the dose within the range the trials used; there is no established reason to exceed it, and more is not known to be better.
Start slow, be smart, read the research, and consult a professional if you have any concerns. This is here to inform your choice, not make it for you.
Common Questions
What is the difference between NMN and NR?
For raising blood NAD+, they are broadly interchangeable, and neither has a demonstrated advantage over the other. They differ in two side matters: NR carries the longer record of human pharmacology, and NMN the more interesting narrow leads. Their US legal standing differs too. Pick on those terms; the core effect is the same either way.
Explore Related
Other pages this one connects to, by the evidence they share, the outcomes they touch, and the ground they cover.
All 12 sources on this page independently checked and cross-referenced.
Thomas Dehli, Founder & Editor, Sacred Lotus
Sacred Lotus has published Chinese medicine reference material since 2001. Integrative pages are held to the same standard as the herb and formula library: cite the source, grade the claim at its real strength, and say where the research has not looked. This page is educational and it is not medical advice. Last reviewed and updated August 9, 2026.
Evidence strength
How confidently the research supports a claim. Strength describes the evidence, not our endorsement.