Most people taking fish oil supplements obtain a small percentage of an optimal dose because they take what is recommended on the bottles label. For a food grade quality fish oil supplements you need to take anywhere from 5-10 capsules of fish oil daily to get the optimal amount.
Pharmaceutical grade fish oil capsules such as those by Doctor's Holistic Rx contain a higher amount of omega 3's. You only have to take 2 softgels of pharmaceutical grade fish oil daily to get the optimal amount of omega 3's.
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http://www.wat.tv/video/12547467
