Omega-3 Supplementation to ADHD Medication in Children

Inclusion Criteria: * Male or female children ages 6-17 years * Living at home * A diagnosis of ADHD (inattentive, hyperactive/impulsive, or combined type) according to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-V) based on clinical assessment * Having a score outside the normal (a T-score of 60 or greater) on the Emotional Control subscale of the Behavior Rating Inventory of Executive Function (parent-report version) or a score outside the normal range (cumulative of 180 or greater) on the Anxious/Depressed, Attention Problems, and Aggressive Behavior subscales of the Child Behavior Checklist for ages (6-18) * Currently on FDA approved traditional stimulant medication (such as Concerta of Adderall XR) or non-stimulant medication (such as Strattera or Tenex) for their ADHD for at least one month * Beings able to come to weekly/monthly study visits for 12 weeks * Having a parent or guardian with a level of understanding of the study Exclusion Criteria: * Having unstable medical illness as determined by the clinician investigator * Having a current diagnosis of schizophrenia or bipolar disorder * Having delusions or hallucinations * Having a bleeding disorder * Taking any other ongoing non-ADHD psychotropic medications other than stable, effective serotonin reuptake inhibitors such as fluoxetine (Prozac), citalopram (Celexa) or medications used on an as-needed basis * Pregnant or nursing females * IQ \< 70 by previous testing or as judged by the clinician investigator * Illegal substance use * Investigator and his/her immediate family; defined as the investigator's spouse, parent, child, grandparent, or grandchild * Presence of suicidal risk, or homicidality * Unwilling/unable to comply with study procedures * Allergies to fish or shellfish or omega 3 fish oils; multiple adverse drug reactions * Poor command of the English language