ADHD is a brain-based condition, and no vitamin or mineral can cure it. But a growing body of research shows that children and adults with ADHD are more likely than others to be low in certain nutrients the brain relies on. For some people, finding and correcting those deficiencies may ease symptoms or help treatment work better.
Key Takeaways
- Studies have found that people with ADHD are more likely to be low in iron, zinc, magnesium and vitamin D. All four play a role in brain chemistry, including dopamine, the chemical messenger most closely tied to ADHD.
- Correcting a true deficiency may modestly improve some symptoms, and in some studies it helped ADHD medication work better.
- Supplements are not a replacement for ADHD treatment. No major medical group recommends them as a stand-alone therapy, and there’s little evidence they help people whose levels are already normal.
- Get tested before supplementing. Simple blood tests can check your levels, and too much iron, zinc or vitamin D can be harmful, especially for children.
- Never stop or change ADHD medication without talking to your doctor.
Why nutrients matter for an ADHD brain
ADHD (attention-deficit/hyperactivity disorder) involves differences in how the brain regulates attention, impulses and activity. Much of that regulation depends on neurotransmitters such as dopamine and norepinephrine, and the brain needs certain vitamins and minerals to make and use them.
That’s why researchers have looked closely at nutrient levels in people with ADHD. It’s still unclear whether low levels help cause symptoms, are a result of eating patterns linked to ADHD, or both. But the overlap is consistent enough that many doctors now consider checking for deficiencies part of a thorough evaluation.
1. Iron
Iron is needed to make dopamine. The body’s iron stores are measured with a blood test for ferritin.
In a French study of 53 children with ADHD, 84% had low ferritin (under 30 ng/mL), compared with 18% of children without ADHD. Lower ferritin was also linked to more severe symptoms. A 2017 analysis that combined 10 studies with more than 2,000 children confirmed that children with ADHD tend to have lower ferritin.
In a small follow-up trial by the same French team, 23 children with ADHD and low ferritin took iron supplements or a placebo for 12 weeks. Those on iron showed improvement in ADHD symptoms.
Good food sources: red meat, poultry, seafood, beans, lentils, spinach and fortified cereals. Eating iron-rich plant foods with vitamin C (such as citrus or peppers) improves absorption.
Caution: Iron supplements are a leading cause of poisoning in young children. Only give iron if a doctor confirms a deficiency, and keep supplements locked away.
2. Zinc
Zinc helps regulate dopamine and supports brain development. Several studies have found lower zinc levels in children with ADHD.
According to the National Institutes of Health’s integrative health center (NCCIH), correcting zinc deficiency alongside standard treatment may modestly improve some ADHD symptoms in some children. One study found that adding zinc meant children needed a lower dose of stimulant medication. However, much of this research comes from regions where zinc deficiency is common, and it’s unknown whether zinc helps people with normal levels.
Good food sources: oysters, beef, poultry, pumpkin seeds, beans, nuts, dairy and whole grains.
Caution: Too much zinc can cause nausea and, over time, lead to copper deficiency. Stick to doses your doctor recommends.
3. Magnesium
Magnesium is involved in hundreds of processes in the body, including nerve signaling and the calming of overactive nerve cells. A 2019 analysis of multiple studies found that children with ADHD had lower blood magnesium levels than children without it.
Treatment studies are small. In an eight-week randomized trial in Iran, 66 children with ADHD who were low in both vitamin D and magnesium received the two supplements together or a placebo. Parents of children on the supplements reported improvements in emotional and social problems, though hyperactivity scores did not change.
Good food sources: pumpkin seeds, almonds, cashews, spinach, black beans, avocado, whole grains and dark chocolate.
Caution: Magnesium supplements can cause diarrhea, and people with kidney disease should not take them without medical advice.
4. Vitamin D
Vitamin D supports brain development and helps regulate the production of several neurotransmitters. Multiple studies have found lower vitamin D levels in children with ADHD.
As with magnesium, the treatment evidence is limited. Some small trials suggest vitamin D taken alongside ADHD medication may slightly improve certain symptoms, but larger, longer studies are needed.
Good food sources: fatty fish such as salmon and sardines, egg yolks, and fortified milk and cereals. Sensible sun exposure also helps your body make vitamin D.
Caution: Very high doses of vitamin D can be toxic over time. Have your level checked before taking high-dose supplements.
What about omega-3s?
Omega-3 fatty acids from fish oil are among the most-studied supplements for ADHD, but the results are mixed. A 2023 Cochrane review of 37 trials found low-certainty evidence that omega-3s may modestly improve some symptoms, alongside stronger evidence of little or no effect on overall parent-rated symptoms. Omega-3s are generally safe, but they’re far less effective than ADHD medication.
What to do next
- Ask your doctor about testing. A blood test can check ferritin, zinc, magnesium and vitamin D levels. This is especially worthwhile if symptoms are severe, medication isn’t working well, or diet is very limited (common in children with ADHD who are picky eaters or have reduced appetite from medication).
- Correct deficiencies under medical guidance. Your doctor can recommend the right dose and recheck levels.
- Focus on food first. A balanced diet with protein, vegetables, whole grains, nuts, seeds and fish supports overall brain health.
- Keep proven treatments in place. Medication, behavioral therapy and support at school or work have the strongest evidence for managing ADHD.
- Be skeptical of products promising to “treat” ADHD. No supplement has been shown to work better than, or replace, standard treatment.
This isn’t a substitute for medical advice. Talk to your doctor before starting supplements or changing any ADHD treatment, especially for a child.
Sources:
- Konofal E, et al. Iron deficiency in children with attention-deficit/hyperactivity disorder. Archives of Pediatrics & Adolescent Medicine, 2004.
- Konofal E, et al. Effects of iron supplementation on attention deficit hyperactivity disorder in children. Pediatric Neurology, 2008.
- Wang Y, et al. Iron status in attention-deficit/hyperactivity disorder: a systematic review and meta-analysis. PLOS ONE, 2017.
- Effatpanah M, et al. Magnesium status and attention deficit hyperactivity disorder (ADHD): a meta-analysis. Psychiatry Research, 2019.
- Hemamy M, et al. The effect of vitamin D and magnesium supplementation on the mental health status of attention-deficit hyperactive children: a randomized controlled trial. BMC Pediatrics, 2021.
- National Center for Complementary and Integrative Health. ADHD and complementary health approaches: what the science says.