Vitamin D is important for the brain function and development. Scientists have found an association between a deficiency of this vitamin and neurodevelopmental problems, including ADHD. For instance, it has been shown that vitamin D levels in children with ADDH are considerably lower than those without this mental issue. Getting sufficient vitamin D, through supplements or the diet, may help improve symptoms, such as hyperactivity, impulsivity, and attention. It’s important for your health. Foods high in vitamin D include fortified cereals, egg yolk, beef liver, sardines, tuna, salmon, and cod liver oil.