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Fish oil supplements are increasingly popular, but it has sometimes been suggested that they could also expose you to the harmful pollutants found in some species of fish.
However, studies have found that most of the widely available supplements contain little or no mercury, dioxins or PCBs.
Most companies use species of fish that are lower on the food chain, like cod and sardines, that accumulate less mercury. Many companies also distill their oils to help remove contaminants.