What Is Nicotinamide Riboside (NR)? A Guide to NR Supplements

Updated on: 8/5/2026

Nicotinamide riboside (NR) is a form of vitamin B3 but is structurally and biochemically different from niacin (NA) and nicotinamide (NAM), the other vitamin B3 alternatives.⁽¹⁾ 

Vitamin B3 is an essential micronutrient that is required to maintain your levels of NAD+ (nicotinamide adenine dinucleotide).

So, what is nicotinamide riboside? Nicotinamide riboside is what is known as a vitamin precursor to NAD+, which means it is a substance that can be converted into NAD+ within the body through metabolic processes.⁽¹⁾

What Is NAD+?

NAD+ is an essential coenzyme found in every cell of your body. A coenzyme is a helper molecule that works alongside enzymes, enabling them to carry out the chemical reactions that keep your cells functioning properly. One of NAD+'s most important roles is helping convert the food you eat into cellular energy, making it critical for the health and function of every cell.

Much of this energy production takes place in the mitochondria—the "powerhouses" of your cells—where NAD+ helps drive the reactions that produce ATP, the primary energy currency of the cell. Without adequate NAD+, these energy-producing processes can't operate efficiently.

Because NAD+ is continually used and recycled throughout the day, your body must constantly replenish it. Nicotinamide riboside (NR) serves as a precursor your body uses to produce NAD+, helping support healthy NAD+ levels as you age.

What Is Nicotinamide Riboside (NR)?

Nicotinamide riboside helps our understanding of how to support cellular health at the molecular level. As a unique form of vitamin B3, nicotinamide riboside stands apart from its cousins niacin and nicotinamide in both structure and function.⁽¹⁾

The key differences lie in how these B3 variants work in your body:⁽¹⁾

• Niacin (nicotinic acid): Requires multiple conversion steps and can cause uncomfortable flushing in high doses

• Nicotinamide (niacinamide): Can inhibit certain beneficial enzymes called sirtuins

• Nicotinamide riboside: Takes the most direct pathway to become NAD+ and is well tolerated

What makes nicotinamide riboside special is its role as a vitamin precursor to NAD+. Think of it as a building block that your cells can easily use to create more NAD+, a coenzyme that's absolutely essential for energy production, DNA repair, and healthy aging.

NAD+ vs NR

If you’re wondering, “What are NAD-boosting supplements, and how do they work?” you’ll be happy to learn that nicotinamide riboside is one of the most effective and researched options available. 

Supplementation with nicotinamide riboside is known to increase NAD+ levels by up to 50% (300mg) and up to 160% (1200mg) in most individuals. However, supplementing with NAD+ as a standalone ingredient is not so effective. NAD+ supplementation, due to the size of the NAD+ molecule, encounters obstacles related to its bioavailability.

NAD+ bioavailability is subpar. NAD+ is a very large molecule that is unable to enter the cell directly. Instead, your body must first break it down into its components before passing through the cell membrane.⁽²⁾

Compared to NAD+, nicotinamide riboside supplementation presents a superior alternative by crossing the cell membrane intact and efficiently elevating NAD+ levels.

How Does Nicotinamide Riboside Work?

Understanding the relationship between nicotinamide riboside and NAD+ is key to understanding how nicotinamide riboside functions as a building block to the NAD+ molecule.

Here’s how it works:

• As stated earlier, nicotinamide riboside, nicotinamide riboside, is a vitamin precursor to NAD+, meaning it can be converted into NAD+ within the body through metabolic processes.

• Nicotinamide riboside is converted to NAD+ by traveling along the shortest and most direct pathway inside your cells (compared to most other precursors), saving your cells time and energy.

• As a result of nicotinamide riboside supplementation, more NAD+ is available to participate in various metabolic processes, including cellular energy production, DNA repair, and cellular signaling.

The discovery of nicotinamide riboside as a precursor of NAD+ in 2004 makes it one of the greatest breakthroughs in NAD+ research by identifying a highly efficient pathway for NAD+ biosynthesis and enabling the translation of NAD+ research from basic science into human clinical investigation.

Nicotinamide riboside is a naturally occurring vitamin as a novel form of vitamin B3, but its applications as a supplement have gained headwinds as a healthy-aging vitamin. It’s highly efficient at boosting NAD+, making it one of the most exciting healthy-aging solutions.

Niagen®, a nature-identical patented form of nicotinamide riboside, effectively elevates NAD+ levels. A clinical study published in Scientific Reports shows that Niagen increases NAD+ up to 161% after 8 days.⁽³⁾

Find out more about NAD aging research.

Benefits of Nicotinamide Riboside

Research continues to uncover the many benefits of nicotinamide riboside, particularly related to its ability to boost NAD+ levels and, in turn, support various aspects of health.⁽⁴⁾

• Supports cellular energy production: Nicotinamide riboside helps optimize cellular energy production by supporting mitochondrial function. When your cells have more NAD+ available, they can more efficiently convert nutrients into usable energy.

• Support for healthy aging: By maintaining NAD+ levels that naturally decline with age, nicotinamide riboside may help support healthy aging.

• Brain cell health: NAD+ plays a crucial role in brain health.

• Heart cell health: Research suggests nicotinamide riboside may support heart health by enhancing cellular energy production and potentially supporting blood vessels.

• Muscle recovery support: Nicotinamide riboside may help support muscle health and recovery by optimizing cellular energy processes and repair mechanisms.

• Immune cell health: NAD+ plays important roles in immune cell function and energy metabolism, and maintaining healthy NAD+ levels through nicotinamide riboside supplementation may help support overall immune health. 

How Can You Get Nicotinamide Riboside Naturally?

While certain foods with nicotinamide riboside exist,  it's important to note that the levels of nicotinamide riboside in dietary sources are generally low, and consuming them alone may not provide significant amounts of nicotinamide riboside.

For example, while nicotinamide riboside is found in milk, it would take about 87 gallons to equal the 300mg you might find in a nicotinamide riboside supplement.

Nicotinamide riboside supplementation may be necessary to achieve meaningful increases in NAD+ levels.

It’s important to remember the relationship between NAD+ and nicotinamide riboside, as increasing your intake of nicotinamide riboside directly influences the elevation of NAD+ levels in your body.

Some natural sources of nicotinamide riboside include:⁽⁵⁾

• Milk: Small amounts of nicotinamide riboside have been identified in cow’s milk.

• Yeast: Brewer's yeast contains nicotinamide riboside, although the levels may vary.

Unfortunately, there is no new data on the amount of nicotinamide riboside measured in brewer’s yeast, but the quantities would likely still be insignificant compared to a capsule of nicotinamide riboside.

Currently, the best way to take nicotinamide riboside is in supplement form. Science points to nicotinamide riboside supplements as an efficient way to achieve the benefits of increased NAD+ from nicotinamide riboside.

300mg of Niagen, our patented form of nicotinamide riboside (NR), is the minimum recommended amount. Taking 1,000mg may further increase NAD+. Both servings are safe and effective.

Is Nicotinamide Riboside Safe?

There are several supplements on the market that contain nicotinamide riboside as an active ingredient. However, Niagen is the only form of nicotinamide riboside that has been successfully notified to the Food and Drug Administration (FDA).

FDA NDIN (New Dietary Ingredient Notification)

So, is nicotinamide riboside safe? Niagen NR has been successfully reviewed twice under the FDA’s New Dietary Ingredient Notification (NDIN) program.⁽⁶⁾

Achieving FDA acceptance of an NDIN is a major accomplishment, as it is a highly rigorous safety review process. 

The NDIN is quite extensive, but here are some of the details that must be included:

• The name of the new dietary ingredient. If the new dietary ingredient is an herb or other botanical, the Latin binomial name (including the author) must be included.
• A description of the dietary supplement or dietary supplements that contain the new dietary ingredient, including the:
• • level of the new dietary ingredient in the product.
  • conditions of use of the product recommended or suggested in the labeling, or if no conditions of use are recommended or suggested, the ordinary conditions of use.
  • history of use or other evidence of safety establishing that the dietary ingredient, when used under the conditions recommended or suggested in the labeling of the dietary supplement, will reasonably be expected to be safe.

FDA GRAS (Generally Recognized As Safe)

When it comes to nicotinamide riboside safety, Niagen is the only form of nicotinamide riboside to be successfully notified to the FDA as Generally Recognized As Safe (GRAS).⁽⁷⁾ An FDA no-objection to a GRAS notification is also a recognition of the quality of the science and the safety of the ingredient.

In addition to receiving approval for use in medical foods by the Brazilian Health Regulatory Agency (ANVISA), Niagen has also been approved for use in food supplements by the European Commission, complementary medicines by the Therapeutic Goods Administration of Australia (TGA), and medical foods by the Food Standards Australia New Zealand (FSANZ). Tru Niagen has also been approved by Health Canada as a Natural Health Product.

As for products on the shelf, Tru Niagen, which features Niagen NR, bears the NSF Certified for Sport seal on Stick Packs and Tru Niagen Pro 1,000mg products.

The Process of Obtaining NSF Certified for Sport Certification Includes:

• A thorough review of the product’s formulation, labeling, and manufacturing processes.
• Laboratory testing was conducted to ensure the product meets the required safety and quality standards.
• Evidence of Good Manufacturing Practices (GMPs), including an on-site audit at the brand’s manufacturing facilities to ensure effective quality control systems. The audit also includes a review of the brand’s documentation and records to ensure compliance with NSF standards.
• Regular inspections and testing for ongoing compliance with the standards.

If the product and manufacturing facilities meet all the requirements, NSF Certified for Sport certification is granted to the sports supplement brand.

The NSF Certified for Sport certification includes current Good Manufacturing Practice (cGMP)certification of the Tru Niagen manufacturing facility and testing to confirm the absence of over 270 athletic banned substances and harmful contaminants like lead and arsenic.⁽⁸⁾

Rules of Current Good Manufacturing Practice (cGMP) for Certified Supplements Include:

• Requires certain activities in manufacturing, packaging, labeling and holding of dietary supplements to ensure that a dietary supplement contains what it is labeled to contain, and is not contaminated with harmful or undesirable substances such as pesticides, heavy metals, or other impurities.

• Requires certain activities that will ensure the identity, purity, quality, strength, and composition of dietary supplements, which is a significant step in ensuring consumers are purchasing the type and amount of ingredients declared.

cGMP regulations require manufacturers to take proactive steps to guarantee the identity, strength, quality, and purity of their athletic supplements for complete supplement safety.

Learn more about the certification process.

What Are the Side Effects of Nicotinamide Riboside?

One of NR’s advantages over other NAD+ precursors is its superior side effect profile. While other forms of vitamin B3 can cause discomfort, such as flushing, nicotinamide riboside has demonstrated excellent tolerability in clinical studies. 

In terms of side effects, niacin and nicotinamide are not ideal. High doses of niacin can cause the skin to flush, and people may experience an itching or hot, prickly sensation on the skin.⁽⁹⁾

Although nicotinamide has no visibly noticeable side effects, studies suggest that nicotinamide can inhibit sirtuin activity, negatively impacting mitochondrial health and cellular repair.⁽¹⁰⁾

In contrast, Niagen NR reports no attributable adverse effects during published clinical studies.

Nicotinamide Riboside vs. Other NAD+ Precursors

Nicotinamide riboside is a novel form of vitamin B3. So how does it stack up to the other vitamin B3s like niacin (NA) or nicotinamide (NAM)?

Nicotinamide Riboside (NR) vs. Niacin (NA) and Nicotinamide (NAM)

Niacin and nicotinamide have been around for many years and appear in many different products, such as multivitamins and breakfast cereals. As such, the FDA considers these vitamin B3 forms to be safe and has “grandfathered” their use.

Nicotinamide riboside (NR) is considered a more efficient precursor to NAD+ compared to niacin (nicotinic acid) due to its simplicity in building NAD+. Nicotinamide riboside bypasses several steps that niacin has to go through to create NAD+ because of the specific biochemical pathways involved in its conversion.

Here's how nicotinamide riboside stands out from NA and NAM:

1. Efficient Conversion: Nicotinamide riboside is converted to NAD+ via a relatively straightforward pathway. When nicotinamide riboside enters the cell, it is phosphorylated by nicotinamide riboside kinase (NRK) to form nicotinamide mononucleotide (NMN), which is then converted to NAD+ by NMN adenylyltransferase (NMNAT).

2. No Inhibition of Enzymes: Nicotinamide, a breakdown product of NAD+, inhibits repair enzymes, which can negatively impact cellular health. Nicotinamide riboside instead has been shown to activate cellular repair activity.

3. Less Energy Consumption: The conversion of niacin into NAD+ requires energy-consuming steps. nicotinamide riboside, on the other hand, requires fewer energy-consuming processes for its conversion into NAD+, making it a more efficient precursor.

4. Research suggests that enzymes involved in the conversion of NA and NAM to NAD+ decline with age and exposure to stressors. In contrast, stressed cells seek out nicotinamide riboside to replenish depleted NAD+ following exposure to damage-inducing stress.

Overall, the simpler and more direct conversion pathway, reduced energy expenditure, and reliance on nicotinamide riboside in times of cellular stress make nicotinamide riboside a more efficient precursor to NAD+ compared to niacin or nicotinamide.

Both niacin and nicotinamide are vitamin precursors to NAD+. But among NAD+ precursors, nicotinamide riboside appears to have special attributes. These include better tolerance and better efficiency.⁽¹¹⁾

Nicotinamide Riboside vs. NMN

Nicotinamide riboside and NMN (nicotinamide mononucleotide) are two of the most prominent NAD+ precursors on the market today. While it’s in our interest to promote nicotinamide riboside and its benefits, it’s also important to note that NMN does fall short as an NAD+ precursor when it comes to quality, scientific research, and regulatory acceptance.

Comparing NR vs. NMN, here’s what makes nicotinamide riboside superior when it comes to building NAD+.

Orally consumed NMN is technically a precursor to nicotinamide riboside and must be converted to nicotinamide riboside before it can pass through cell membranes. Inside the cell, the nicotinamide riboside converts back to NMN, and then to NAD+. Given that nicotinamide riboside can enter cells, this distinction is important to make when it comes to efficiency. This has been shown in a study on NMN’s metabolism in mammalian cells, indicating that due to a phosphate group attached to the molecule, NMN cannot enter cells directly and must convert into nicotinamide riboside before it enters.⁽¹²⁾ 

Unlike NMN, Niagen NR has 45+ published human clinical studies to date, more than 10 of which show that it effectively and safely increases NAD+ levels.

How to Take Nicotinamide Riboside Supplements

Nicotinamide riboside supplements are available in several convenient forms to fit different preferences and lifestyles. Most commonly, you’ll find nicotinamide riboside in capsule form, which offers precise dosing and easy portability. Powder forms and stick packs are also available for those who prefer to mix their supplements with water or other beverages. 

For dosing, research supports 300mg as the minimum effective amount. 

Most people should focus on the importance of taking NAD+ supplements consistently. Nicotinamide riboside can be taken with or without food. Many users prefer taking nicotinamide riboside in the morning to support cellular energy levels throughout the day, though timing can be adjusted to fit individual lifestyles.

Nicotinamide Riboside FAQs

What should you look for in a quality nicotinamide riboside supplement?

When choosing a nicotinamide riboside supplement, prioritize products with third-party testing, proper manufacturing standards, and regulatory approval. Additionally, look for nicotinamide riboside supplements made with NRCl (nicotinamide riboside chloride) with the USP monograph, which is the type of nicotinamide riboside used in Tru Niagen supplements. This monograph, referenced by the FDA, means there’s a publicly available definition of what NRCl is, how it should be tested, and the standards it must meet to be considered pure and authentic.⁽¹³⁾ Unfortunately, many NAD+ supplements fail to meet label claims, making it crucial to select reputable brands. Look for products like Tru Niagen with FDA GRAS status, NSF certification, and published clinical research supporting its effectiveness.

Why is NAD+ important?

Due to its critical role in cellular energy production, the absence of NAD+ would halt most bodily functions. Without NAD+, your lungs wouldn’t be able to draw in oxygen, your heart wouldn’t be able to pump blood, and your brain synapses wouldn’t be able to fire.

NAD+ also helps facilitate DNA repair and regulate cellular activity by working with sirtuins and poly (ADP-ribose) polymerases (PARPs), key enzymes involved in regulating cells’ response to damage from things like overeating, excess drinking, sleep disruption, and sedentary patterns.

Nicotinamide riboside is known to boost NAD+ levels, which are essential for cellular repair and mitochondrial health. 

Can nicotinamide riboside slow down aging?

Research in 2012 from a team at the Department of Pharmacology at the University of New South Wales showed age-associated changes in NAD+ metabolism.⁽¹⁴⁾ The study revealed that NAD+ levels can decline by up to 65% in human skin tissue between the ages of 30 and 70 and that NAD+ depletion may play an important role in the aging process.

In the paper, the researchers stated, “A strong negative correlation was observed between NAD+ levels and age in both males and females.”

In addition, NAD’s involvement in cellular respiration, particularly in the mitochondria, contributes to overall mitochondrial health. And the scientific community holds a keen interest in NAD+’s involvement in mitochondrial dysfunction, one of the hallmarks of aging.

In recent years, research has focused on understanding NAD+'s role in addressing these age-associated functional declines.

By providing a precursor for NAD+ synthesis, nicotinamide riboside offers a natural way to boost NAD+ levels and support healthy aging.

Discover the benefits of nicotinamide riboside supplements for aging.

What’s the best time of day to take nicotinamide riboside?

While morning is often recommended to support energy levels throughout the day, the best time can vary based on individual needs and goals. Some people prefer taking nicotinamide riboside with breakfast to establish a consistent routine, while others may benefit from splitting doses throughout the day. The most important factor is consistency rather than specific timing.

Can I take nicotinamide riboside every day?

Yes, daily nicotinamide riboside supplementation is both safe and recommended. Consistency will help maintain elevated NAD+ levels, as your body continuously uses and replenishes its NAD+ supply. Clinical studies have demonstrated the safety of daily nicotinamide riboside supplementation over extended periods.

The Future of Nicotinamide Riboside

General interest in NAD+ and aging has garnered more interest in NAD+ research in recent years, and NR’s unique property of efficiently elevating NAD+ levels makes it an exciting prospect in scientific research.

Clinical trials continue to investigate the potential benefits of increased NAD+ levels. Also, NAD+ has been receiving media coverage from news sources that investigate its healthy-aging and cellular-energy-boosting capabilities.

Currently, several studies are underway surrounding the effects of nicotinamide riboside in other health conditions, examining the impact of nicotinamide riboside on cellular health within the brain muscle, and heart.

And pharma-grade Niagen offers new possibilities for a holistic approach to wellness.