ADHD (Attention Deficit Hyperactivity Disorder) affects approximately 5% of school-age children in the UK — meaning around 1 in 20. While medication (stimulants and non-stimulants) and behavioural therapy remain the primary evidence-based treatments, there is growing, credible evidence for the role of nutrition and specific supplements in supporting brain function in ADHD. This guide covers the evidence fairly.
What ADHD Is and How It Affects the Brain
ADHD involves impairment of executive functions — the cognitive skills that regulate behaviour, attention, impulse control, and working memory — caused by differences in the development and functioning of prefrontal cortex circuits. Dopamine and noradrenaline signalling is specifically impaired in ADHD; stimulant medications work by increasing the availability of both neurotransmitters in prefrontal synapses. ADHD is strongly heritable (heritability approximately 70–80%), is a neurodevelopmental condition (present from birth), and persists into adulthood in approximately 60% of cases.
Dietary Factors With Evidence
Omega-3 fatty acids (EPA/DHA) have the strongest nutritional evidence in ADHD. Multiple meta-analyses show that omega-3 supplementation (EPA-rich, 1–3g EPA+DHA daily) produces modest but consistent improvements in ADHD symptoms — particularly hyperactivity and inattention — in children with low baseline omega-3 status. Effects are smaller than stimulant medication but meaningful, and omega-3 is safe and beneficial for general brain development regardless. Iron: studies have found lower ferritin levels in children with ADHD compared to controls, even without anaemia. Iron supplementation in children with confirmed low ferritin reduces ADHD symptoms. Ferritin testing (GP) is worthwhile for any child with ADHD. Zinc: similarly, zinc deficiency has been associated with ADHD symptom severity. Zinc supplementation as an adjunct to stimulant medication has shown benefit in some studies, particularly in zinc-deficient children. Magnesium: deficiency associated with hyperactivity; supplementation alongside Vitamin B6 has evidence in specific subgroups.
Foods and Additives
The “Feingold diet” (eliminating artificial colours and additives) had mixed early evidence, but a robust 2007 Lancet RCT (McCann et al.) found that artificial colours and sodium benzoate measurably increased hyperactivity in both ADHD and non-ADHD children. Following this, the FSA recommended that manufacturers voluntarily remove the six “Southampton colours.” Avoiding artificial colours (sunset yellow, quinoline yellow, carmoisine, allura red, tartrazine, ponceau 4R) in children with ADHD is a reasonable and evidence-supported dietary modification. Sugar causes hyperactivity is a persistent myth not supported by controlled trials.
Frequently Asked Questions
Should I try supplements before medication for my child’s ADHD?
Nutritional interventions are appropriate adjuncts to standard treatment — not substitutes for it in children with moderate-severe ADHD. Omega-3, iron correction (if deficient), and zinc are reasonable first-line additions. For mild ADHD or ADHD awaiting formal diagnosis, a trial of nutritional optimisation alongside behavioural strategies while awaiting CAMHS assessment is sensible. Medication decisions should be made collaboratively with a paediatrician or psychiatrist.
Does screen time worsen ADHD?
High screen time is associated with worse ADHD outcomes in research, likely through sleep disruption (which significantly impairs executive function), dopamine reward circuit habituation (making lower-stimulation tasks even harder to sustain attention on), and physical inactivity. Appropriate limits on recreational screen time, particularly in the evening, are evidence-based for ADHD management.
Browse omega-3 and children’s supplements at Huncoat Pharmacy. Related: Focus Guide, Children’s Vitamins.
At Huncoat Pharmacy: Pharmacy First for children, Browse children’s supplements, NHS children’s services.