Sales of fish-oil supplements have boomed as evidence of the health benefits of omega-3 fatty acids has mounted. But how safe are those supplements? The same pollutants that contaminate fish--including mercury, dioxins, DDT and PCBs--can also contaminate the fish oils made from them. The latest troubling news: a study finding that levels of a flame retardant are rising in samples of cod-liver oil.
--D.B.
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