During stone age -humans used to have better diet - then the ratio of Omega 3 to Omega 6 was 1:1. Now the ratio is skewed to 1:30 in some places. The source for Omega 3 is from fish liver & Algae - and for Omega 6 - it is from Sunflower,corn,soy & nuts. It is prudent to have a balance of both omega. I happened to meet a team from Deomega, company based out Fredrikstad , Norway. They sell omega 3- they source the fish from waters of Norway and extracts omega 3 and delivers at your factory gate- so you can mix it in juice, milk or Ice cream.
more on Deomega :http://www.ingredients.no/eway/default.aspx?pid=242&trg=MainPage_8406&MainPage_8406=10853:0: