Urolithin A vs NAD+ Boosters (NR and NMN): What's the Difference?

Cellular energy, aging, and the confusion these supplements share

If you have spent any time in the longevity aisle, you have likely seen Urolithin A sitting next to NAD+ boosters like NR (nicotinamide riboside) and NMN (nicotinamide mononucleotide). They are frequently mentioned in the same breath because they all relate to mitochondria, the tiny structures inside your cells that produce most of your usable energy. But the two categories work on different parts of the same story, and understanding that difference helps you make a more informed choice with your healthcare provider.

Think of your mitochondria as a fleet of power plants. One approach focuses on making sure each plant has enough fuel and working parts. The other focuses on retiring the broken-down plants so the fleet stays efficient. Both matter. Neither is a cure for anything, and neither replaces medical care.

What is NAD+ and why does it decline?

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in every living cell. It is a workhorse molecule that helps convert the food you eat into cellular energy and participates in hundreds of enzymatic reactions, including those involving sirtuins and DNA-repair enzymes. Research consistently observes that tissue NAD+ levels tend to decline with age, which is one reason NAD+ has become a focal point in the science of healthy aging.

Because NAD+ itself is not efficiently absorbed as a whole molecule when taken orally, supplement strategies instead deliver precursors, smaller building blocks the body can use to replenish NAD+.

How NR and NMN aim to raise NAD+

NR (nicotinamide riboside) and NMN (nicotinamide mononucleotide) are two of these precursors. The idea is straightforward: supply more raw material, and cells have more to work with when producing NAD+. Human trials support the "raising levels" part of this claim. A widely cited randomized, double-blind study of nicotinamide riboside published in Nature Communications found that oral NR increased blood NAD+ metabolites and was well tolerated in healthy adults (https://www.nature.com/articles/s41467-018-03421-7). Additional randomized trials have reported similar NAD+ elevation and a reassuring short-term safety profile for NR.

NMN has also been studied in humans. A randomized, multicenter, double-blind, placebo-controlled dose-dependent trial in healthy middle-aged adults reported that oral NMN was well tolerated and was associated with increased blood NAD+ levels (https://pubmed.ncbi.nlm.nih.gov/36482258/). It is worth noting that the U.S. regulatory status of NMN has been a subject of ongoing discussion, another reason to check with a knowledgeable healthcare provider before use.

The important nuance: raising NAD+ is a measure of what the supplement does biochemically. It is a different question from whether the quality of your mitochondria improves.

How Urolithin A is different: mitophagy and mitochondrial renewal

Urolithin A is a compound your gut microbiome can produce from ellagitannins, the polyphenols found in pomegranates, walnuts, and some berries. Many people, however, do not host the specific gut bacteria needed to make meaningful amounts, which is why it is studied as a direct supplement.

Rather than supplying fuel, Urolithin A is studied for supporting mitophagy, the cell's quality-control process for identifying damaged or worn-out mitochondria and recycling them. You can read a deeper explainer in our guide to what mitophagy is. By encouraging the cleanup of underperforming mitochondria, the theory is that the remaining pool stays healthier and more efficient, supporting mitochondrial renewal over time. For more background on the compound itself, see our overview of Urolithin A.

This is the core distinction. NAD+ boosters address the supply of a coenzyme. Urolithin A addresses mitochondrial housekeeping and quality. They sit at different points in the same broad system.

What the human evidence shows for Urolithin A

Urolithin A has been examined in several randomized, placebo-controlled human trials. A study in Nature Metabolism found that Urolithin A engaged mitophagy-related gene expression and was safe in healthy older adults (https://www.nature.com/articles/s42255-019-0073-4). A later randomized trial in Cell Reports Medicine reported that Urolithin A supported measures of muscle endurance in middle-aged adults (https://pubmed.ncbi.nlm.nih.gov/35584623/). More recently, work published in Nature Aging in 2025 has continued to explore Urolithin A's effects on muscle and cellular aging markers (https://www.nature.com/articles/s43587-025-00996-x). These findings describe structure/function effects and are not claims to treat, cure, or prevent any disease.

Side-by-side comparison

Feature	Urolithin A	NAD+ boosters (NR, NMN)
What it is	A gut-microbiome metabolite of pomegranate/walnut polyphenols, taken as a direct supplement	Precursor molecules (nicotinamide riboside; nicotinamide mononucleotide) the body converts toward NAD+
Primary mechanism	Supports mitophagy and mitochondrial quality/renewal (upstream)	Aims to raise availability of the NAD+ coenzyme that fuels metabolism
Human evidence	Multiple randomized, placebo-controlled trials on mitophagy markers and muscle endurance	Randomized trials showing raised blood NAD+ levels and good short-term tolerability
Commonly studied dose	Often studied around 500-1,000 mg per day in trials	NR often studied around 250-1,000 mg/day; NMN around 250-900 mg/day
Outcomes explored	Muscle endurance, mitochondrial gene markers, cellular renewal	NAD+ blood levels, metabolic markers, general tolerability

Doses above reflect ranges reported in published research and are for educational context only, not a recommendation. Your appropriate approach depends on your individual health, and should be discussed with a qualified healthcare provider.

Are they complementary or competing?

Because Urolithin A and NAD+ boosters act on different steps, some people view them as potentially complementary rather than interchangeable, one supporting mitochondrial quality, the other supporting coenzyme supply. That said, "different mechanisms" does not automatically mean "better together," and rigorous head-to-head or combination trials in humans are still limited.

If mitochondrial support is your interest, it is also worth remembering that supplements work best alongside fundamentals like regular movement, resistance exercise, quality sleep, and a polyphenol-rich diet. Our guide on how to improve mitochondrial function naturally covers those foundations, and you can explore the compound-specific research in our roundup of Urolithin A benefits.

Whatever direction you take, the single most important step is to talk with your healthcare provider before starting or combining any supplements, and especially if you are pregnant, nursing, managing a health condition, or taking any medications.

Where SOMA fits

SOMA focuses specifically on Urolithin A. If you have decided, with your provider, that mitophagy support is what you are looking for, our SOMA Urolithin A gummies deliver a studied-range daily amount in a convenient form. As always, a supplement is one part of a broader healthy-aging approach, not a substitute for medical guidance.

Frequently asked questions

Is Urolithin A the same as an NAD+ booster?

No. NAD+ boosters like NR and NMN are precursors intended to raise levels of the NAD+ coenzyme. Urolithin A is a distinct compound studied for supporting mitophagy and mitochondrial quality. They target different steps in cellular energy biology.

Can I take Urolithin A and an NAD+ booster together?

Some people consider them complementary because they act on different mechanisms, but human data on combining them is limited. Whether it makes sense for you is a decision to make with your healthcare provider, who can weigh your full health picture and any medications.

Which one has stronger human evidence?

They have been studied for different things. Urolithin A has several randomized, placebo-controlled trials focused on mitophagy markers and muscle endurance. NR and NMN have human trials primarily demonstrating that they can raise blood NAD+ levels and are generally well tolerated over the short term.

Why does the body make less NAD+ as we age?

Research suggests NAD+ decline reflects a combination of reduced production and increased consumption in aging cells and tissues. This observed decline is part of why NAD+ precursors have attracted so much interest, though supplementing them is not a proven anti-aging treatment.

Does Urolithin A boost NAD+?

Urolithin A is not primarily a NAD+ precursor. Its studied role is supporting mitophagy and mitochondrial renewal rather than directly supplying NAD+ building blocks. If raising NAD+ specifically is your goal, that is a separate conversation to have with your healthcare provider.