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Limited evidenceLongevity & antioxidants

NAD+ (Oral/Liposomal)

Products selling NAD+ itself rather than a precursor. NAD+ is too large and unstable to be absorbed intact, and even the precursors that do raise blood NAD+ have not delivered convincing clinical benefits.

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What the science says

  • Raising NAD+ levels Limited evidence

    Oral nicotinamide mononucleotide has been shown to be safe and to raise blood NAD+ levels in healthy subjects, which is why most credible products use a precursor. Direct oral or liposomal NAD+ has no published human pharmacokinetic trial demonstrating intact absorption; the molecule is broken down to nicotinamide and ribose before uptake.

  • Muscle mass and function Limited evidence

    A systematic review and meta-analysis of nicotinamide mononucleotide and nicotinamide riboside trials found no meaningful improvement in skeletal muscle mass and only inconsistent effects on function, despite the precursors reliably raising NAD+. Raising NAD+ and improving outcomes are clearly not the same thing.

Dosage & safety

Studied doseNo dose is supported for NAD+ itself. Precursor trials used 250–1,000 mg/day of nicotinamide mononucleotide or 250–1,000 mg/day of nicotinamide riboside. Liposomal NAD+ products typically list 100–500 mg with no bioavailability data.
SafetyPrecursor trials report good short-term tolerability, with occasional nausea, flushing and headache. Long-term safety beyond about a year is unknown, and there is an unresolved theoretical concern about NAD+ boosting in people with existing cancer. Avoid in pregnancy and breastfeeding.

How to take it

TimingTiming does not matter.
With food?With or without food.
Worth knowingIf you are going to spend money here, a nicotinamide riboside or NMN product with published human pharmacokinetics is a better bet than liposomal NAD+, which has none.

Frequently asked questions

Is oral or liposomal NAD+ absorbed?

No published human trial shows oral or liposomal NAD+ is absorbed intact; the molecule is broken down to nicotinamide and ribose before uptake. That is why credible NAD+ products use a precursor such as NMN or nicotinamide riboside, which have been shown to raise blood NAD+.

Do NAD+ supplements work for anti-ageing or muscle?

The evidence is limited: a meta-analysis of NMN and nicotinamide riboside trials found no meaningful gain in muscle mass and inconsistent effects on function, even though the precursors reliably raised NAD+. Raising NAD+ and improving health outcomes are not the same thing.

Is NMN or NR better than an NAD+ supplement?

If you are going to buy one, an NMN or nicotinamide riboside product with published human pharmacokinetics is a better bet than liposomal NAD+, which has none. Precursor trials used 250–1,000 mg/day, while liposomal NAD+ labels list 100–500 mg with no bioavailability data.

Are NAD+ supplements safe?

NAD+ precursor trials report good short-term tolerability, with occasional nausea, flushing and headache, but safety beyond about a year is unknown. There is an unresolved theoretical concern about NAD+ boosting in people with existing cancer, and NAD+ products should be avoided in pregnancy and breastfeeding.

Scientific references

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