Fish Oil is an important supplement and can aid you in many different ways. It is a macro nutrient and its a dietary necessity, not a dietary supplement. Companies market it as a supplement because of how limited it is in western diets. In some countries Fish Oil supplements are non existent. Here is a quick article from CrossFit Invictus talking about Fish Oil needs for exercisers. Click HERE for a Google Spreadsheet version of the table in the article.

How Much Fish Oil Should You Take? – CrossFit Invictus