The first ingredient in the ingredients list is essential because is actually more out of which one ingredient than any other ingredient associated with food.
With more even more people, waking to the benefits of omega 3 it is an eminent health food. Fish hoki, tuna, and mackerel are the sources. https://www.youtube.com/playlist?list=PLQSnJhLvLzmugEQ_ebjijzKB5lbacPep4