Fish oils are derived from the fat of deep-sea, cold water fish and are a natural source of Omega-3 Essential Fatty Acids (EFAs). Omega-3 is an important nutrient for maintaining a healthy brain and nervous system. Fish Oils themselves are said to contribute to healthy heart function and joint flexibility as well as supporting brain, nerve, and visual function. Ultimate Omega 3 naturally supplies the Omega-3 fatty acids EPA and DHA.