Limited evidenceGeneral health

Children's Omega-3

Fish oil in kid-sized doses, gummies or flavoured liquids, marketed for brain and eye development. Omega-3s are genuinely essential nutrients, but in children who already eat adequately the trials mostly fail to show cognitive or academic gains.

Evidence last reviewed: August 2026

What the science says

Cognitive performance in children and adolescents Limited evidence
A meta-analysis of omega-3 effects on domain-specific cognitive test performance in youths found no consistent benefit across most domains, with only scattered signals. Supplementing well-nourished children does not reliably improve learning or memory.
Visual and neurodevelopmental outcomes in infants Limited evidence
A Cochrane review of long-chain polyunsaturated fatty acid supplementation in infants born at term found no clear or lasting benefit on visual acuity or neurodevelopment. Some short-term visual measures improved in individual trials but the pooled evidence was not convincing.
ADHD symptoms Moderate evidence
A biomarker-stratified systematic review and meta-analysis in paediatric ADHD found small symptom improvements, concentrated in children with low baseline omega-3 status. The effect is much smaller than that of standard ADHD treatment.

Dosage & safety

Studied doseTrials in children typically used 200–600 mg combined EPA plus DHA daily; ADHD trials often used up to about 1000 mg. Most children's gummies deliver far less, sometimes under 100 mg, so check the EPA/DHA figure rather than the fish oil figure.

SafetyWell tolerated; burping, fishy aftertaste and loose stools are the common effects. Gummies are often high in added sugar and low in actual EPA/DHA. Avoid cod liver oil products in children without checking vitamin A content, and take care with fish allergy. Discuss with a doctor if the child takes anticoagulants.

Scientific references

Omega-3 and its domain-specific effects on cognitive test performance in youths: A meta-analysis
Emery S, Häberling I, Berger G — Neurosci Biobehav Rev, 2020
Long chain polyunsaturated fatty acid supplementation in infants born at term
Jasani B, Simmer K, Patole SK — Cochrane Database Syst Rev, 2017
Baseline omega-3 nutritional status and supplementation response in pediatric attention-deficit/hyperactivity disorder: a systematic review and biomarker-stratified meta-analysis
Fu X, Feng L, Jiang M — Front Public Health, 2026

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