Fish oil supplements come from a number of varieties

Fish oil supplements come from a number of varieties The primary form of energy storage in animals is fat in sucess the form of triglycerides. The tissue that contains this fat is known as adipose tissue. In addition to being an energy storage depot, the adipose serves as a holding area for fat-soluble compounds that are in queue for excretion.

Fish oil supplements come from a number of varieties, notably menhaden, sardines, anchovies and salmon, the triglycerides in these fish having higher levels of the omega-3 fatty acids that go by the initials EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid).

Your concerns are reasonable when you consider that EPA and DHA come from the fats in fish. If the fish chosen to make supplements have been exposed to contaminants, such as PCBs, pesticide residues, and/or mercury, which is often present sucess as a contaminant in the form of the fat-soluble methyl mercury, it follows that there would be levels of these contaminants in their body fat.