Omega-3s and ADHD in Children: What the Research Says About DHA and Fish Oil
Omega-3 fatty acids—particularly DHA and EPA—play an important role in brain development, attention, and behaviour in children. There is lots of research as to whether increasing these nutrients can help support children with ADHD.
Here’s what the science currently tells us.
Why Omega-3s Matter for the Brain
Two key omega-3 fatty acids are especially important for the developing brain:
DHA (docosahexaenoic acid)
• A major structural component of brain cell membranes
• Supports brain growth and communication between nerve cells
EPA (eicosapentaenoic acid)
• Influences inflammation and brain signalling
• Plays a role in dopamine and serotonin pathways linked to attention and mood
Because the brain is nearly 60% fat by dry weight, the types of fats available in the body can influence how efficiently brain cells function.
Children With ADHD Often Have Lower Omega-3 Levels
Multiple studies have found that children diagnosed with ADHD tend to have lower blood levels of DHA and EPA compared to children without ADHD.
Researchers believe this may affect:
• Dopamine signalling (important for focus and motivation)
• Neuronal membrane flexibility
• Communication between brain cells
This observation is one of the reasons omega-3 supplementation has been explored as a supportive therapy.
What the Research Shows about Omega 3’s and ADHD
Large reviews of randomized controlled trials show that omega-3 supplementation can lead to small but meaningful improvements in ADHD symptoms.
A meta-analysis published in Neuropsychopharmacology found that omega-3 supplements improved:
• Attention
• Hyperactivity
• Impulsivity
Researchers concluded that omega-3s may be helpful as a supportive or adjunct therapy, particularly for children with lower omega-3 levels.
Cognitive Benefits Seen in Some Studies
Other research has shown benefits beyond behaviour.
A large randomized trial of school-aged children who took 600 mg of DHA daily for 16 weeks showed improvements in:
• Reading ability
• Working memory
• Parent-reported behaviour in lower-performing children
This suggests omega-3s may support cognitive performance and learning, not just ADHD symptoms.
What Dose Is Commonly Used in Research?
There is no single universally recommended dose for ADHD, but most clinical studies fall within a similar range.
For school-aged children (around 4–12 years old), research typically uses:
Total omega-3s (EPA + DHA):
Approximately 1,000–1,500 mg per day
Within that total amount, many clinicians aim for:
• EPA: 500–1,000 mg daily
• DHA: 300–600 mg daily
When Might Parents See Changes?
Omega-3s work slowly because they must gradually incorporate into brain and cell membranes.
Most studies show that noticeable improvements occur after 8–12 weeks of consistent supplementation.
Safety Considerations
Omega-3 supplements are generally considered safe for children, but it’s still important to choose quality products.
Look for fish oil that is:
• Third-party tested for heavy metals and contaminants
• Purified and concentrated
• Appropriate for children’s dosing
If you’re looking for a high-DHA omega-3 for kids, this is the one I recommend most often in practice.
👉 You can view my recommended fish oil here.
Common mild side effects can include fishy burps or minor digestive upset.
The Bottom Line when it comes to ADHD and omega 3’s
Omega-3 fatty acids are an important nutrient for brain health, and children with ADHD often have lower levels of them.
Research suggests that fish oil supplements containing both EPA and DHA can provide small improvements in attention and behaviour, especially when used alongside other supports like quality sleep, good overall nutrition, lots of movement, chiropractic care, and behavioural strategies.
Omega-3s can be a helpful piece of the puzzle in supporting a child’s developing brain.
