Omega-3 fatty acid is a type of polyunsaturated fats that the body needs in order to function properly. It typically comes from oily fish, but not all types of fish. Omega 3 can reduce inflammation, help prevent heart disease, improve mood and memory, lower blood pressure, and help stabilize blood sugar levels. EPA and DHA are two types of omega-3 fats found in fish that the body needs for these benefits.