A tiny molecule called NAD+ may hold the key to slowing aging and preventing diseases like Alzheimer's and Parkinson's. Researchers from the University of Oslo, Akershus University Hospital, and international collaborators have just published a comprehensive expert review in Nature Aging, bringing together insights from more than 25 scientists, including leading experts in aging biology and metabolism. Their focus: understanding how this small but powerful molecule could reshape how we age and protect against age-related diseases .

What Is NAD+ and Why Does It Matter as We Age?

NAD+ is often called a cell's "fuel regulator" because it plays a central role in producing energy, repairing DNA, and keeping cells working properly. Think of it as your cells' battery charger and maintenance crew rolled into one. However, NAD+ levels naturally decrease as people age, and this decline has been linked to memory problems, reduced muscle strength, and a higher risk of age-related diseases .

According to longevity experts, NAD+ is a central cellular coenzyme required for mitochondrial energy production, DNA repair, and regulation of stress response pathways. This makes it extremely important for cellular health, given that mitochondria are what provide each cell with energy and are crucially involved in cell signaling and cellular death .

"NAD+ levels decline with age, and this reduction is associated with impaired mitochondrial function, reduced genomic stability, and increased cellular stress, all of which are linked to biological aging processes," explained Şebnem Ünlüişler, Chief Longevity Officer and genetic engineer at the London Regenerative Institute.

Şebnem Ünlüişler, Chief Longevity Officer, London Regenerative Institute

Can NAD+ Supplements Actually Slow Down Aging?

The big question is whether we can reverse NAD+ decline by taking supplements. The answer is more nuanced than a simple yes or no. NAD+ itself is not significantly absorbed from food, but the body synthesizes it from dietary precursors such as tryptophan and vitamin B3 forms including niacin, nicotinamide, and nicotinamide riboside . This is where supplements come in.

Early clinical trials are showing promise. Researchers have examined years of laboratory research and clinical studies exploring ways to raise NAD+ levels using vitamin-like compounds such as nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN). Early findings from these trials report improvements in memory, physical movement, and metabolic health .

However, the researchers stress an important caveat: larger and longer studies in patients are needed to confirm how effective these approaches are across different diseases. The field is moving fast, with clinical trials underway worldwide, including in Norway, to test NAD+ precursors like NR and NMN .

How to Boost NAD+ Levels: What the Research Shows

• NR and NMN Supplements: Supplementation with precursors such as nicotinamide riboside (NR) or nicotinamide mononucleotide (NMN) has been shown to increase NAD+ levels in humans, though long-term outcome data remain limited .
• Dietary Precursors: The body can synthesize NAD+ from dietary sources of vitamin B3 forms, including niacin, nicotinamide, and nicotinamide riboside, as well as from tryptophan .
• Intravenous NAD+ Therapy: Intravenous NAD+ is used in some clinical contexts, though this approach is less accessible to the general public and long-term outcome data remain limited .

The challenge is that aging, inflammation, and metabolic stress can lower NAD+ availability even when the body is continuously recycling it. This is why supplementation has become an area of intense research interest .

Dr. Jianying Zhang, one of the lead authors of the Nature Aging review, emphasized the complexity of the challenge ahead. "Fine-tuning NAD+ metabolism holds promise for delaying age-related health decline as well as disease such as premature ageing diseases," he stated. "But to truly unlock its potential, we need to better understand the right doses, long-term safety, and interindividual variability in response to NAD+ augmentation strategies" .

Why Are Scientists Excited About NAD+ Right Now?

The timing of this expert review is significant. NAD+ supplements have entered a rapidly expanding global supplement market, leading to confusion and debate over which options work best and whether results seen in animal studies will translate to humans. At the same time, clinical trials are underway worldwide to test NAD+ precursors, creating both scientific opportunity and public interest .

"NAD+ is fundamental to life, yet there is still confusion and noise in the field about which supplements work best and how they should be used. Our article consolidates the evidence and provides a scientific roadmap to guide both ongoing research and future clinical use," said Dr. Evandro Fei Fang-Stavem, senior author and head of the Fang Lab at University of Oslo and Akershus University Hospital.

Dr. Evandro Fei Fang-Stavem, Senior Author and Head of Fang Lab, University of Oslo and Akershus University Hospital

The review also highlights potential applications beyond general aging. Early studies hint at improvements in memory, metabolism, and physical function, with particular interest in whether NAD+ boosters could help protect against neurological diseases like Alzheimer's and Parkinson's .

What Comes Next: The Research Roadmap

The authors of the Nature Aging review emphasize that although NAD+-based supplements and therapies are being widely investigated, stronger collaboration and more rigorous clinical testing are essential. These steps will be critical to turn early findings into safe and effective treatments for aging and age-related diseases .

The international team includes contributors from the University of Copenhagen in Denmark, Chiba University in Japan, Harvard Medical School in the United States, and the Buck Institute for Research on Aging, among other institutions. This global collaboration reflects the growing recognition that NAD+ research could have major implications for how we approach aging and disease prevention .

For now, the message from experts is clear: NAD+ is a promising avenue for longevity research, but we are still in the early stages. If you are considering NAD+ supplements, it is worth discussing with your healthcare provider, especially since the field is evolving rapidly and individual responses may vary.