Docosahexaenoic acid, or DHA, is a polyunsaturated omega-3 fatty acid found throughout the body. It is a major structural fat in the brain and retina accounting for up to 97% of the omega-3 fats in the brain and up to 93% of the omega-3 fats in the retina. It is also a key component of the heart. Numerous studies confirm that everyone, from infants to adults, benefits from an adequate supply of DHA.