While plant-based ALA is the starting point, EPA and DHA are the powerful, ready-to-use forms of omega-3, found almost exclusively in oily fish and other marine sources. They are vital for brain function and vision, and play a key role in helping to regulate your body's inflammatory response. Instead of a strict daily milligram target, the simplest and most effective strategy is to aim for two portions of fish per week, ensuring at least one of them is oily. For those who don't eat fish, a quality supplement providing around 450mg of combined EPA and DHA daily is an effective alternative.