Superiority of Omega-3 Versus Placebo on the Improvement of ADHD in Children

Inclusion Criteria: * Age between 6 and 11 years 11 months. * ADHD diagnosis according to DSM-IV-TR criteria * Children whose parents are able to reliably meet all visits and all the tests required for this study based on the researcher judgment * Patient representative (either parents or legal guardians) must understand the conditions of the study and sign the informed consent Exclusion Criteria: * Patients who do not meet diagnostic criteria for ADHD * Patients with a previously known allergy or intolerance to the components of Omega- 3 supplement * Patients with underlying diseases that, according to medical criteria , are not eligible for supplementation with Omega-3 fatty acids : fatty liver disease (or other liver disease), bleeding disorders and cardiovascular disease * Patients with allergies to fish and /or shellfish * Patients who have received ADHD pharmacological treatment or fatty acid supplements at any dose for more than 7 consecutive days within the last 3 months * Patients who have received psychological or psycho-educational treatment in the past 3 months * Patients who have had some kind of psychometric diagnostic tests in the last year * Patients with scores corresponding to a lower mental age (more than 1 year less) according to the Wechsler Intelligence Cubes Scale for Children (WISC-IV) * Patients with severe emotional problems according to the CAS or STAIC tests * Patients participating in another clinical trial