The majority of fish oil takers get just a fraction of an optimal dose because they only take what is indicated on the bottles label. When taking a low quality fish oil you want to take between 5-10 capsules of fish oil on a daily basis to get the optimal amount.

Pharmaceutical grade fish oil supplements such as those by Doctor's Holistic Rx contain a higher amount of omega 3 fatty acids. You can take just two capsules of pharmaceutical grade fish oil on a daily basis to get the optimal amount of omega 3 fatty acids.
http://www.amazon.com/Doctors-Holistic-Rx-Pharmaceutical-Distillation/dp/B00KKSELFC
http://www.wat.tv/video/12547173