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.

Evidence last reviewed: August 2026

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.

Scientific references

Modulation of the immune system by human milk and infant formula containing nucleotides
Pickering LK, Granoff DM, Erickson JR, Masor ML, Cordle CT, Schaller JP, Winship TR, Paule CL, Hilty MD — Pediatrics, 1998
Effect of dietary ribonucleotides on infant immune status. Part 2: Immune cell development
Buck RH, Thomas DL, Winship TR, Cordle CT, Kuchan MJ, Baggs GE, Schaller JP, Wheeler JG — Pediatr Res, 2004
Dietary nucleotides and fecal microbiota in formula-fed infants: a randomized controlled trial
Singhal A, Macfarlane G, Macfarlane S, Lanigan J, Kennedy K, Elias-Jones A, Stephenson T, Dudek P, Lucas A — Am J Clin Nutr, 2008

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