Hello, ARA, also known as arachidonic acid, is also a polyunsaturated fatty acid, which is an essential nutrient for baby's physical development. Foods containing polyunsaturated fatty acids include breast milk, soybean oil, sunflower oil, walnut oil, safflower oil, soybean salad oil and nuts. DHA is one of the essential fatty acids for human body. Deep-sea fish containing DHA: tuna, tuna (yellowfin tuna), salmon (salmon), whales, seals, herring, hairscales, salmon (Atlantic salmon), trout, cod, swordfish, herring, tuna, sardines and eels.