Has DHA/EPA omega-3 supplementation been found to benefit children with ADHD (Attention-Deficit-Hyperactivity-Disorder)?

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A number of studies have suggested that lower levels of circulating omega-3 fatty acids (DHA/EPA) are often found in children with ADHD and that such levels can be increased via DHA/EPA supplementation. However, a recent review (Raz, R and Gabis, L., Dev.Med.Child.Neurol., 51:580-592(2009)) of randomized controlled trials have generally been unsuccessful in demonstrating any behavioural treatment effects upon DHA/EPA supplementation.