Nicotinamide Riboside function

May 11, 2026

Healthier aging. More energy. Better recovery after exertion. These are themes that more and more people are consciously focusing on. One substance that often comes up in research in this context is Nicotinamide Riboside (abbreviated as NR).

NR is a form of vitamin B3 and a direct precursor of NAD, a molecule that is present in every cell in your body. Without enough NAD⁺, your cells simply can’t function optimally. You notice this in your energy level, but also in how well your body recovers and how resilient your cells remain as you get older.

In this article, you’ll discover what NR is exactly, how it works, what science has said about it so far, and how you can use it as a supplement.

What is Nicotinamide Riboside?

Nicotinamide Riboside is one of the three forms of vitamin B3—alongside niacin and nicotinamide. Unlike the other forms, NR has the unique property that it can be converted into NAD⁺ very efficiently.

NR is naturally found in small amounts in foods such as milk, fish, meat, and certain grains. However, the amounts are so small that you likely won’t get enough through diet to noticeably increase your NAD⁺ levels.

NAD⁺ is a coenzyme involved in hundreds of processes in the body, including:

Energy production – converting nutrients into usable energy (ATP)
DNA repair – repairing damage to genetic material
Cell communication – transmitting signals that determine how cells behave
Defense against oxidative stress – protecting cells from free radicals

As we age, NAD⁺ levels in our body decrease. Research associates this with a slower metabolism, less energy, and less efficient recovery.

How nicotinamide riboside works: how exactly does this supplement work?

When you take an NR supplement, it enters your bloodstream and is converted into NAD⁺ through a number of biochemical steps. This conversion takes place via the so-called salvage pathway, a kind of recycling route in your cells that ensures NAD⁺ stores are replenished.

Once formed, NAD⁺ is used in the mitochondria—the energy factories in your cells. There, it helps produce ATP, the universal energy unit needed for almost everything your body does, from muscle contraction to brain activity⁶.

In addition, NAD⁺ plays a role in activating sirtuins, enzymes involved in DNA repair, reducing inflammation, and cell renewal. These sirtuins are often mentioned in research in connection with healthy aging⁵.

How nicotinamide riboside works in supplements

In supplement form, NR is often available in 150 mg capsules. The usual dosage is between 150 and 300 mg per day, with many people choosing 2 capsules spread throughout the day for a steady NAD⁺ replenishment.

Why not take NAD⁺ directly?

NAD⁺ supplements do exist as well, but this substance is not absorbed well in the intestines. NR has a smaller structure and can therefore pass through cell membranes more easily, after which it is converted into NAD⁺ inside the cell itself.

Combinations with other substances

Some users combine NR with resveratrol and TMG.

Resveratrol is associated in research with activation of sirtuins.
TMG (trimethylglycine) supports methylation processes, which are important for converting NR into NAD⁺

How quickly do you notice anything from NR?

This varies per person. In studies, higher NAD⁺ levels are often measured within 2 to 4 weeks. Whether you also feel subjectively more energy depends on factors such as your lifestyle, age, diet, and overall health.

Some people report more physical energy, faster recovery after exercise, and a more alert feeling. Others only notice subtle changes after a few months. Because NR mainly works at the cellular level, effects can build up slowly.