What Foods Contain Nicotinamide Riboside?

Nicotinamide riboside, often abbreviated NR, shows up naturally in a handful of everyday foods, but in far smaller amounts than most people expect. The richest confirmed dietary source is cow’s milk, where NR accounts for roughly 40% of all NAD+ precursor vitamins present. Beyond milk, NR has been detected in meat, certain vegetables, and fermented drinks like beer, though the research cataloging its presence across the food supply is still surprisingly thin. Understanding which foods contain NR, how much they actually provide, and whether those amounts matter for your health requires looking at what food scientists have measured so far and what they haven’t.

Cow’s Milk Is the Best-Studied Source

The most detailed measurements of NR in any food come from cow’s milk. A study in The Journal of Nutrition found that cow’s milk typically contains around 12 micromoles of total NAD+ precursor vitamins per liter. Of that total, about 60% is plain nicotinamide (the familiar form of vitamin B3), and the remaining 40% is NR.¹ That makes NR a significant component of milk’s B3 vitamin profile, not just a trace curiosity.

To put those numbers in perspective, a liter of milk gives you roughly 4 to 5 micromoles of NR. That’s a meaningful fraction of milk’s vitamin content, but it’s orders of magnitude below the doses used in human supplementation trials, which typically range from 250 to 1,000 milligrams per day. You would need to drink an impractical volume of milk to approach supplement-level doses through diet alone. Still, the finding matters because it established that NR isn’t just a lab compound or supplement ingredient; it’s a naturally occurring nutrient in one of the most widely consumed foods on the planet.

Conventional Milk Has More NR Than Organic

One unexpected detail from the milk research is that not all milk is created equal when it comes to NR content. The same study that quantified NR in cow’s milk found that conventional milk contained more NR than milk sold as organic.¹ The researchers didn’t fully explain why this difference exists, but it likely relates to differences in feed, breed distribution, and farming practices between conventional and organic operations.

This is worth knowing if you’re specifically trying to maximize NR intake from dietary sources, though the practical difference is modest given how small the amounts are overall. It also highlights a broader point: the NR content of any food isn’t fixed. It depends on the conditions under which the food was produced, and for most foods, nobody has systematically mapped those variables yet.

Processing Can Destroy NR in Milk

How you buy your milk matters more than whether it’s organic. Standard pasteurization, the heat treatment applied to most fresh milk, does not destroy NR. But ultra-high-temperature (UHT) processing, the method used for shelf-stable milk that can sit unrefrigerated for months, completely wipes it out.²

This makes intuitive sense once you understand that NR is not a particularly stable molecule. Research on its physical and chemical properties has shown that NR chloride, the salt form commonly used in supplements, degrades upon melting and breaks down in solution through a process called hydrolysis.³ Heat accelerates this degradation. UHT processing heats milk to at least 135°C (275°F), which is hot enough to shatter NR molecules entirely. Regular pasteurization operates at much lower temperatures, around 72°C (161°F) for 15 seconds, and NR survives that treatment intact.

If you’re shopping with NR content in mind, reach for fresh pasteurized milk rather than the shelf-stable cartons. This is also relevant for anyone using milk powder or heavily processed dairy products, where heat exposure during manufacturing likely reduces or eliminates NR.

Beer and Other Fermented Drinks

Fermented foods and beverages are the second category where researchers have actually measured NR. The reason is biological: the yeast strains used in fermentation naturally produce NR as part of their own metabolism. In baker’s and brewer’s yeast (Saccharomyces cerevisiae), NR is an endogenous metabolite, meaning the cells make it as a normal part of staying alive.⁴ Specific enzymes in yeast cells convert other NAD+ metabolites into NR and release it.⁵

This yeast-driven production means some NR ends up in the final product. An exploratory study of craft beers found NR concentrations ranging from about 0.5 to 3.25 micromolar, though the amounts varied dramatically depending on which yeast strain was used. Interestingly, NR was only detected in beers brewed with one particular commercial strain (US-05), while beers made with other strains contained none at measurable levels. Adding hops during fermentation also boosted NR production substantially, with late hop additions pushing concentrations up to around 6 micromolar after a standard 21-day fermentation and over 11 micromolar when fermentation was extended to 45 days.⁶

These numbers are fascinating from a food science perspective, but they don’t make beer a practical source of NR. Even the highest concentrations measured were still vanishingly small, and you’d need to drink an absurd quantity to approach a meaningful dose. The real significance is what the findings imply about fermented foods more broadly: any product made with active yeast, from bread to wine to kombucha, could potentially contain some NR. Almost none of these have been tested yet.

Meat, Poultry, and Fish

NR has been detected in animal tissues, which makes sense because all living cells use NAD+ and its precursors in their basic energy metabolism. A study examining goose meat found that NR chloride content increased as the birds aged, with higher levels detected in meat from 300-day-old geese compared to younger animals.⁷ This was part of a broader metabolic profiling effort rather than a study focused specifically on NR, so we don’t have precise concentration data comparable to the milk measurements.

Beyond this, the evidence is mostly inferential. Reviews of the topic note that NR and its relative NMN have been found in meat in general, alongside vegetables and milk.⁸ Fish, poultry, and red meat all contain NAD+ and its metabolites, and some fraction of that will be in the NR form. But detailed quantification across different cuts and species is largely missing from the literature. Nobody has done for chicken breast or salmon fillets what the milk researchers did for dairy.

What we can say with some confidence is that muscle tissue from any animal will contain at least trace amounts of NR, because it’s part of fundamental cellular metabolism. Cooking likely degrades some of it, given NR’s sensitivity to heat, but how much survives in a grilled steak versus a slow-braised roast is unknown.

Vegetables and Plant Foods

Vegetables are mentioned in the scientific literature as containing NR, but the data behind that claim is remarkably thin. The same review that lists vegetables alongside meat and milk as NR-containing foods also acknowledges that the search for food sources of NR is “still an unexplored field of research.”⁸ That’s a telling admission. It means you’ll sometimes see lists circulating online claiming that broccoli, avocados, or edamame are “rich in NR,” but the actual analytical evidence supporting those claims is sparse at best.

Some of the confusion comes from conflating NR with other forms of vitamin B3. Niacin (nicotinic acid) and nicotinamide are well-established nutrients found across many plant and animal foods, and their content has been cataloged for decades. NR is a different molecule, and while it’s part of the same vitamin B3 family, its distribution across foods hasn’t been mapped with nearly the same rigor. A food that’s high in niacin is not necessarily high in NR.

Plant cells do use NAD+ in their metabolism, so NR is likely present at some level in many fruits and vegetables. But “likely present” and “present in meaningful amounts” are very different claims, and the science hasn’t caught up enough to distinguish between the two for most plant foods.

Why So Little Is Known About NR in Food

Given how much attention NR has gotten in the supplement and anti-aging world, it’s striking how little work has been done to map its natural occurrence across the food supply. There are practical reasons for this. NR is chemically fragile: it breaks down in solution, is sensitive to heat, and degrades under conditions that other vitamins tolerate without trouble.³ This instability makes it harder to measure accurately. Traditional food composition methods weren’t designed with NR in mind, and developing reliable assays for it in complex food matrices has been a slow process.

There’s also an economic reality. The research interest in NR has been driven primarily by the supplement industry and aging research, not by food science or public health nutrition. Most of the human clinical trials involve purified NR at doses far above what any diet could provide, so there’s been little commercial incentive to figure out exactly how much NR sits in a serving of mushrooms or a glass of orange juice. The researchers who have done food-level work tend to frame their findings as basic science rather than dietary guidance, and they’re the first to point out how much remains unmeasured.

Dietary NR Versus Supplements

The gap between what food provides and what supplements deliver is enormous. NR supplements typically contain 250 to 1,000 milligrams per capsule. The NR in a liter of milk measures in micromoles, which translates to perhaps a few hundred micrograms at most. You’re looking at a difference of roughly a thousandfold between a typical supplement dose and a generous serving of the richest known food source.

This doesn’t mean dietary NR is worthless. Your body can also obtain NR indirectly, through digestion of NAD+ itself. When you eat foods containing NAD+ or its related coenzymes, your digestive system breaks them down, and some of the resulting fragments are NR or NMN, which your body can then absorb and use to rebuild NAD+.⁸ So the effective NR you get from a meal is probably higher than the pre-formed NR content alone would suggest, because some of it is generated from other compounds during digestion.

The primary dietary precursors for NAD+ synthesis, including amino acids from protein and nicotinic acid, are readily absorbed in the upper digestive tract.⁹ This means your body has multiple parallel pathways for making NAD+ from food, and NR is just one of them. A diet rich in protein, niacin-containing foods, and dairy provides the raw materials for NAD+ production through several routes at once, even if the direct NR contribution from each food is small.

The Role of Gut Microbes

One piece of the puzzle that’s easy to overlook is what happens inside your gut. Your intestinal bacteria have their own NAD+ metabolism, and they both consume and produce B3 vitamins including NR. Research has shown that vitamin B3 cycles between the host and the gut microbiome: what your body doesn’t absorb in the upper gut becomes available to bacteria lower down, and those microbes can produce metabolites that feed back into your own NAD+ supply.⁹

This means your effective NR status isn’t determined solely by the NR content of your food. It’s also shaped by which microbes live in your gut and how active they are. Two people eating the exact same diet could end up with different levels of NR available for absorption, depending on the composition of their microbiome. This is an area of active research, and it complicates any simple story about “eat food X to get nutrient Y.”

Foods People Claim Contain NR but Lack Strong Evidence

If you search online for NR food sources, you’ll find confident-sounding lists that include items like broccoli, cabbage, cucumbers, mushrooms, and avocados. These lists typically trace back to broader B3 or NAD+ precursor data rather than specific measurements of NR itself. Some of the confusion is understandable: NR is part of the vitamin B3 family, and foods that are known to be good sources of niacin or nicotinamide get lumped in as though they’re also confirmed NR sources.

Mushrooms are a particularly common claim. Certain mushroom species are rich in various NAD+ metabolites, and it’s plausible that some NR is among them. But “plausible” isn’t the same as “measured and confirmed.” Until someone runs the same kind of targeted analysis on mushrooms that was done on cow’s milk, listing them as a significant NR source is getting ahead of the evidence.

The honest answer is that the confirmed, quantified food sources of NR are limited to cow’s milk, certain craft beers, and some animal tissues. Everything else is either a reasonable inference from what we know about cellular metabolism or an extrapolation from related B3 compounds. If a list of NR foods includes more than a few items with specific concentrations attached, it’s probably mixing up NR with other forms of vitamin B3.

How Yeast Brewing Conditions Change NR Levels

The craft beer research offers an unusual window into how NR content can be manipulated through production methods. Not all yeast strains produce detectable NR; in the study of craft beers, only one out of the tested commercial strains generated it. And the timing and type of hop addition during fermentation had a dramatic effect, with late-stage hopping roughly doubling NR concentrations compared to unhopped fermentation.⁶

This raises an interesting question for food science: could fermentation conditions be optimized to produce NR-enriched foods? Yeast already makes NR through identified enzymatic pathways, and the enzymes responsible have been characterized.⁵ In theory, selecting the right yeast strain and fermentation conditions could boost NR content in bread, fermented dairy products, or other yeast-based foods. Nobody has tried this at a commercial scale, but the biology suggests it’s feasible. Whether the resulting levels would be nutritionally relevant is another question entirely, given how small the concentrations remain even under optimized lab conditions.

What a Practical NR-Conscious Diet Looks Like

If you’re trying to get more NR from your diet without supplements, the evidence-based playbook is short. Fresh pasteurized cow’s milk is the only food with well-quantified NR content and intact NR after processing. Avoid UHT or shelf-stable milk if NR specifically matters to you.² Meat and poultry contribute some NR, though quantities are unspecified for most common cuts. Fermented foods made with active yeast contribute trace amounts.

More broadly, eating a varied diet that includes good sources of all B3 forms, including protein-rich foods, whole grains, and dairy, supports your body’s NAD+ production through multiple pathways. Your cells don’t strictly need pre-formed NR; they can build NAD+ from tryptophan in protein, from nicotinic acid in grains and legumes, and from nicotinamide in meat and dairy. NR is one input among several, and obsessing over it at the dietary level probably matters less than ensuring you have adequate B3 intake overall. The people most likely to benefit from targeted NR are those taking concentrated supplements for specific health goals, not those trying to squeeze extra micrograms out of their grocery list.