Omega-3 fatty acids are the structural and functional component of all cell membranes. They are considered essential because they cannot be produced in the body but are required for healthy biological functions. Fish oil is rich in Omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), making it one of the best sources of Omega-3 fatty acids. In humans, DHA is predominantly found in the central nervous system and the retina of eye. DHA and EPA help support the development of the brain, eyes and nerves in children up to 12 years of age and help support cognitive health/brain function for people of all ages. Also, along with conventional therapy, fish oil can help reduce pain associated with rheumatoid arthritis.