NAD vs NMN: what is the difference?

What is NAD+?

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in every cell, where it helps turn food into energy and supports cell repair.

Think of NAD+ as a shuttle. It carries energy between chemical reactions inside your cells, particularly in the mitochondria. It is also used by enzymes involved in DNA repair and cell signalling. You can read more on our NAD+ ingredient page.

Ageing and many health conditions are associated with lower NAD+ levels (Freeberg and colleagues, 2023). However, a 2025 review noted that a clear age-related decline has only been consistently seen in a limited number of human studies, and that much of the evidence comes from rodents.

What is NMN?

NMN (nicotinamide mononucleotide) is a precursor, a building block the body converts directly into NAD+.

Your body constantly recycles NAD+ through what scientists call the salvage pathway. Nicotinamide, a form of vitamin B3, is turned into NMN, and NMN is then turned into NAD+. So NMN sits one step before NAD+ in the chain. See our NMN ingredient page for a short summary.

NAD+ vs NMN: the key differences

The main difference is that NAD+ is the active coenzyme, while NMN is a raw material the body uses to make it.

	NAD+	NMN
What it is	The active coenzyme used in cells	A precursor the body converts into NAD+
Molecule size	Larger	Smaller
Human research as a supplement	Limited	Several small randomised trials
Common supplement formats	Liposomal liquids, capsules	Capsules, powders, blends

What do human trials of NMN show?

Small trials show NMN can raise NAD+ levels in the blood, with some early signals for muscle and physical function.

In a 10-week trial, 25 postmenopausal women with prediabetes and overweight or obesity took 250 mg of NMN a day or a placebo. NMN improved a measure of insulin sensitivity in muscle (Yoshino and colleagues, 2021). This was a specific group of women, and the result does not show a general anti-ageing effect.

In a 60-day trial, 80 healthy adults aged 40 to 65 took a placebo or 300 mg, 600 mg or 900 mg of NMN a day. Blood NAD+ rose in all three NMN groups, and was highest at 600 mg and 900 mg. NMN groups also walked further in a six-minute walking test than the placebo group. NMN was well tolerated up to 900 mg a day, and insulin sensitivity did not change (Yi and colleagues, 2023).

A 2023 review of these compounds concluded that they are safe, well tolerated and can raise NAD+ and related compounds, but that only limited data show clinically meaningful improvements, and most studies have been small (Freeberg and colleagues, 2023).

What about taking NAD+ directly?

There is much less human research on swallowing NAD+ itself than on precursors such as NMN.

Most published trials have used precursors, mainly NMN and nicotinamide riboside, rather than NAD+ itself. Results from NMN studies should not be assumed to apply to oral NAD+. Liposomal NAD+ products aim to protect the molecule through digestion, but this approach has not yet been well studied in humans.

Is NMN legal in the UK and Europe?

NMN is classed as a novel food in the EU, which means it needs authorisation before it can be sold as a food.

A 2022 European Commission consultation confirmed NMN as a novel food because there was no history of consumption in the EU before 1997. In 2026 the European Food Safety Authority (EFSA) gave a positive safety opinion on one company's NMN at 300 mg a day for the general population, excluding pregnant and breastfeeding women. Formal authorisation was still to follow at the time.

Rules can change, so it is worth checking how any product you buy is described and sold.

Why not just take vitamin B3?

Vitamin B3 in the form of nicotinamide is also an NAD+ precursor, and it is an everyday nutrient rather than a specialist supplement.

Nicotinamide feeds into the same salvage pathway that makes NMN and then NAD+. Vitamin B3 (niacin) contributes to normal energy-yielding metabolism and to the reduction of tiredness and fatigue. For many people, a varied diet or a B complex covers their B3 needs. NMN and NAD+ supplements are a more targeted, and less well-studied, step beyond that.

Which should you choose?

NMN has more human trial data, while NAD+ products appeal to people who want the end molecule itself, so the right choice depends on what matters to you.

• If you value evidence: NMN has the larger body of human research, though it is still early.
• If you want a combined formula: some products pair NAD+ or NMN with resveratrol, a polyphenol antioxidant studied for its role in healthy ageing.
• If you want to keep it simple: sleep, regular exercise and a varied diet that includes sources of vitamin B3 all support normal NAD+ production.

Who should take care?

Most people tolerate NMN well in short trials, but some groups should be cautious.

• Avoid NAD+ and NMN supplements during pregnancy and breastfeeding, as safety has not been established.
• If you have diabetes or take medicines that affect blood sugar, speak to your GP or pharmacist first, as some research has looked at insulin sensitivity.
• If you have a long-term condition, a history of cancer, or take regular medication, check with a health professional before starting.

Exploring NAD+ and NMN

If you would like to try NAD+ itself, our Liposomal NAD Plus combines liposomal NAD+ with trans-resveratrol. If you prefer an NMN-based blend, Juve-N8 combines NMN with resveratrol, quercetin and fisetin. You can explore more in our longevity collection.

Whichever you choose, treat it as one part of a wider routine, and give it time.