Consumption of fish more often than once a week can lead Yoga poses silhouette to accumulation of these pollutants. Concern about PCBs in fish oil has led to increased awareness Yoga poses silhouette of the need to purchase products documented to be low in PCBs and mercury.
A review of studies of fish oil supplements in the Medical Letter found evidence that eating fatty fish e.g., salmon twice a week or taking over-the-counter fish oil capsules 1,000-1,500 mg/day reduced mortality in patients with acute coronary disease but not in those with chronic coronary disease Fish Oil Supplements, 2006.
In some of these studies, eating fish was more protective than taking fish oil capsules. This may reflect differences in quality and in EPA and DHA content. It is best to refrigerate fish oil products to prevent the oils from becoming rancid.