Most people taking fish oil supplements are getting only a fraction of a good daily dose because they just take what is shown on the label of the bottle. For food grade fish oil you want to take anywhere from five to ten softgels of fish oil per day to achieve the best quantity.

Pharmaceutical grade fish oil products like that from Doctor's Holistic Rx contain a higher amount of omega 3's. You need to take just 2 1000 mg softgels of pharmaceutical grade fish oil per day to get the best quantity of omega 3's.
http://www.amazon.com/Doctors-Holistic-Rx-Pharmaceutical-Distillation/dp/B00KKSELFC
http://www.wat.tv/video/12547065