Docosahexaenoic acid (DHA) is an omega-3 fatty acid vital for neurological development and function. Children with attention-deficit/hyperactivity disorder (ADHD) have been found to have low levels of blood plasma levels of DHA. The present series of case studies examined the potential of improving the attentional abilities of individuals with ADHD with the supplementation of DHA. The Test of Variables of Attention (TOVA), a psychometrically valid tool used to evaluate attentional abilities, was employed as an objective measure of attention. to evaluate the effects of supplementation. The results indicated that DHA supplementation of 267mg b.i.d., 12 hours apart, was effective in improving the attentional abilities of individuals with ADHD.