If you've been researching healthy ageing, you've probably come across three terms that seem to appear everywhere: NAD+, NR (nicotinamide riboside) and NMN (nicotinamide mononucleotide).
They're often discussed as though they're competing ingredients, but that's not actually the case.
NR, NMN and NAD+ are all part of the same biological pathway. Rather than working against each other, they work together to support one of the body's most important molecules, NAD+.
Understanding how these compounds are connected can help you make more informed decisions when choosing supplements designed to support cellular health, energy metabolism and healthy ageing.
What Is NAD+?
NAD+, short for nicotinamide adenine dinucleotide, is a coenzyme found in every cell of the body. It plays a vital role in hundreds of biological processes and is essential for converting the food you eat into usable cellular energy.
Without adequate NAD+, cells cannot efficiently produce ATP, the body's primary source of energy.
NAD+ also plays an important role in:
- Cellular energy metabolism
- Healthy mitochondrial function
- DNA repair processes
- Cellular communication
- Supporting enzymes known as sirtuins
- Normal neurological function
Because virtually every cell relies on NAD+, maintaining healthy levels is considered an important aspect of healthy cellular function.
Why Do NAD+ Levels Decline?
One reason NAD+ has become a major focus of longevity research is that its levels naturally decline with age.
Researchers believe this decline may be influenced by several factors, including:
- Ageing
- Oxidative stress
- Chronic inflammation
- Poor sleep
- Physical and psychological stress
- Environmental factors
As NAD+ availability decreases, the body's ability to efficiently support cellular energy production may also change.
Scientists continue to investigate how supporting the body's natural production of NAD+ may help maintain healthy cellular function throughout life.
Why Can't You Simply Take NAD+?
This is one of the most common questions people ask.
Although NAD+ is available as a supplement, it is a relatively large molecule that is not thought to be efficiently utilised when taken orally.
Instead, the body naturally produces NAD+ using precursor compounds, including NR and NMN.
These precursors provide the building blocks needed for the body's own NAD+ production pathways.
For this reason, much of the current research has focused on supporting the body's natural ability to produce NAD+, rather than supplementing with NAD+ itself.
What Is NR?
Nicotinamide Riboside (NR) is a naturally occurring form of vitamin B3 and one of the most extensively researched NAD+ precursors.
After absorption, NR enters cells and is converted into NMN before ultimately becoming NAD+.
Rather than acting as NAD+ itself, NR provides the body with one of the raw materials needed to produce it.
Because of this, researchers continue to investigate NR for its role in supporting:
- Cellular energy production
- Healthy ageing
- Brain health
- Muscle function
- Cardiovascular health
- Healthy metabolism
NR has attracted considerable scientific interest because it has been evaluated in multiple human clinical studies and has been shown to increase NAD+ levels in healthy adults.
What Is NMN?
Nicotinamide Mononucleotide (NMN) is another naturally occurring compound involved in the production of NAD+.
Unlike NR, NMN sits one step closer to NAD+ in the body's biochemical pathway.
After entering the cell, NMN undergoes one final enzymatic conversion before becoming NAD+.
For many years, scientists questioned whether NMN could enter cells directly because of its larger molecular structure.
More recent research has identified specialised transport proteins that may assist with NMN uptake in certain tissues, making it one of the fastest-growing areas of longevity research.
Current human studies continue to investigate NMN for its potential role in supporting:
- Cellular energy production
- Healthy blood vessel function
- Muscle performance
- Healthy metabolic function
- Healthy ageing
While research continues to evolve, NMN remains one of the most widely studied ingredients in the healthy ageing space.
How Does the Body Produce NAD+?
Your body has several natural pathways for producing NAD+, helping ensure cells have a continuous supply to support normal function.
One simplified pathway looks like this:
Vitamin B3 → NR → NMN → NAD+
Once NAD+ has been used inside the cell, it doesn't simply disappear.
Instead, much of it is recycled through what scientists call the NAD+ salvage pathway, allowing the body to continually regenerate this important coenzyme and efficiently support cellular energy production.
This recycling process is one reason NAD+ is considered so important for maintaining healthy cellular function throughout life.
NR vs NMN: Which Is Better?
One of the most common questions people ask is whether NR or NMN is the "better" option.
The answer is not as straightforward as choosing one over the other.
Both compounds are NAD+ precursors, meaning they help the body produce NAD+ through slightly different stages of the same biological pathway. Rather than competing ingredients, they work within the same system.
NR
Nicotinamide riboside has been studied extensively in human clinical trials and is recognised for:
- Strong clinical research
- Good stability
- Efficient absorption
- Its ability to increase NAD+ levels in healthy adults
NMN
Nicotinamide mononucleotide has attracted growing scientific interest because it sits one step closer to NAD+ production.
Current research is investigating its role in supporting:
- Cellular energy production
- Healthy metabolic function
- Muscle function
- Healthy ageing
- Vascular health
As research continues to evolve, both ingredients remain important areas of investigation.
Rather than asking which ingredient is "better," a more helpful question is which formulation best aligns with your individual health goals.
Can NR and NMN Be Taken Together?
Because NR and NMN enter the NAD+ pathway at different stages, many people wonder whether they can be used together.
Current research suggests they are not mutually exclusive. Both contribute to the body's natural production of NAD+, although more research is needed to determine whether combining them provides additional benefits compared with using either ingredient alone.
Scientists continue to investigate how different tissues utilise NAD+ precursors and whether individual responses vary depending on the pathway involved.
Why Is NAD+ So Important?
NAD+ supports countless biological processes throughout the body.
Although it is best known for its role in cellular energy production, its functions extend well beyond energy metabolism.
Cellular Energy Production
NAD+ helps mitochondria convert carbohydrates, fats and proteins into ATP, the body's primary source of cellular energy.
Because every cell requires energy to function, NAD+ plays a fundamental role throughout the body.
Healthy Cellular Function
NAD+ is required by several enzyme systems involved in maintaining normal cellular processes.
Researchers continue to investigate its relationship with healthy ageing and normal cellular maintenance.
Brain Health
The brain has one of the highest energy demands of any organ.
Maintaining healthy NAD+ levels helps support normal neurological function and cognitive performance by contributing to normal cellular energy metabolism.
Muscle Function
Muscle tissue requires significant amounts of energy during both exercise and everyday movement.
Healthy NAD+ production supports normal energy metabolism within muscle cells.
Supporting Healthy NAD+ Levels Naturally
While NR and NMN continue to receive significant attention, they represent just one part of the healthy ageing picture.
Everyday lifestyle habits remain the foundation of long-term health.
Research consistently supports the importance of:
- Regular physical activity
- Resistance training
- A balanced, nutrient-rich diet
- Quality sleep
- Stress management
- Maintaining a healthy body composition
- Avoiding excessive alcohol consumption
- Not smoking
These lifestyle factors support overall metabolic health and healthy cellular function throughout life.
The Bottom Line
Although NR, NMN and NAD+ are often discussed separately, they are all part of the same biological pathway.
NAD+ is essential for cellular energy production and many other normal biological processes. Because NAD+ levels naturally decline with age, researchers continue to investigate nutritional strategies that support the body's natural production of this important coenzyme.
Both NR and NMN are recognised as NAD+ precursors, each contributing to the same pathway through slightly different stages. Current research continues to explore their roles in healthy ageing, cellular energy production and metabolic health.
As with any area of emerging science, supplementation should complement, not replace, the foundations of good health. A balanced diet, regular exercise, quality sleep and effective stress management remain the cornerstones of healthy ageing and overall wellbeing.
References
- Yoshino J, Baur JA, Imai SI. NAD+ Intermediates: The Biology and Therapeutic Potential of NMN and NR. Cell Metabolism. 2018;27(3):513-528.
- Rajman L, Chwalek K, Sinclair DA. Therapeutic Potential of NAD-Boosting Molecules: The In Vivo Evidence. Cell Metabolism. 2018;27(3):529-547.
- Trammell SAJ, Schmidt MS, Weidemann BJ, et al. Nicotinamide Riboside Is Uniquely and Orally Bioavailable in Mice and Humans. Nature Communications. 2016;7:12948.
- Yoshino M, Yoshino J, Kayser BD, et al. Nicotinamide Mononucleotide Increases Muscle Insulin Sensitivity in Prediabetic Women. Science. 2021;372(6547):1224-1229.
- Igarashi M, Miwa M. NAD+ Metabolism, Aging and Longevity. NPJ Aging. 2022.
- National Institutes of Health Office of Dietary Supplements. Vitamin B3 (Niacin) Fact Sheet for Health Professionals.
