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Limited evidenceImmunity

Dietary Nucleotides

The building blocks of DNA and RNA, added to infant formula for decades because breast milk contains them. The trial evidence is almost entirely in formula-fed infants; nothing supports the adult supplements sold on the same rationale.

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What the science says

  • Better vaccine responses in formula-fed infants Moderate evidence

    A randomized multicentre trial found that infants fed nucleotide-supplemented formula had higher antibody responses to Haemophilus influenzae type b and diphtheria vaccination than those on unsupplemented formula. A later randomized study of dietary ribonucleotides reported effects on infant immune cell development in the same direction.

  • Effects on the infant gut Limited evidence

    A randomized controlled trial in formula-fed infants found that nucleotide supplementation altered faecal microbiota composition. The clinical significance of that shift was not established.

  • Nothing for adults Limited evidence

    No trial supports nucleotide supplements for immune function in adults. The adult products extrapolate from infant formula research in a population whose nucleotide requirements are entirely different.

Dosage & safety

Studied doseInfant formula trials used roughly 30–70 mg of nucleotides per litre of formula. Adult supplements typically supply 100–500 mg per day with no evidential basis for that figure.
SafetyWell tolerated in the infant formula trials. Nucleotides are a purine source, which is a theoretical consideration for people with gout or hyperuricaemia. There is no long-term safety data for adult supplementation, and no data in pregnancy.

How to take it

TimingTiming does not matter.
With food?Either way.
Worth knowingThe 100–500 mg on adult labels is not scaled from anything — the evidence is in infant formula at a few tens of milligrams per litre, which does not translate.

Frequently asked questions

Do nucleotide supplements help adult immunity?

No trial supports dietary nucleotide supplements for immune function in adults, so the evidence is limited. Adult products extrapolate from infant formula research in a population with entirely different nucleotide requirements.

Why are nucleotides added to infant formula?

Breast milk contains nucleotides, and a randomized multicentre trial found infants on nucleotide-supplemented formula had higher antibody responses to Haemophilus influenzae type b and diphtheria vaccination. The evidence for this infant effect is moderate.

How much dietary nucleotides per day?

Infant formula trials used roughly 30–70 mg of nucleotides per litre of formula. Adult supplements typically supply 100–500 mg per day with no evidential basis for that figure.

Are nucleotide supplements safe with gout?

Dietary nucleotides are a purine source, which is a theoretical concern if you have gout or hyperuricaemia. There is no long-term safety data for adult nucleotide supplementation and no data in pregnancy.

Scientific references

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