The same product had the second-highest concentration of arsenic (2.27 ppm). A tuna product that contained one of the lowest amounts of omega-3s also contained the highest concentration of mercury (0.41 ppm), which is just below the EPA's and FDA's recommended limit for avoiding fish (0.46 ppm). Canned and packaged tunas, particularly albacore tunas, were generally the most contaminated with mercury. In half the products, mercury and/or arsenic were discovered at levels suggesting that consumption should be limited: Those high in mercury should not be eaten more than once or twice per week, while those high only in arsenic should not be eaten more than once daily. Several products contained significantly lower amounts of DHA and EPA than claimed on the label. In comparison, canned and packaged tuna provided as little as 45 mg to about 440 mg of DHA and EPA, with the exception of one albacore tuna product that contained 1,294 mg of DHA and EPA per serving. Sardines provided about 1,600 mg to 1,800 mg of DHA and EPA per 85 gram serving, while salmon provided 400 mg to 700 mg per 56 gram serving. The tests showed that, based on recommended serving sizes, sardines and salmon contained much higher amounts of omega-3 fatty acids than tuna. ConsumerLab also tested the oil in products to determine if it was fresh or rancid. To find out, ConsumerLab purchased and tested popular canned and packaged tuna, salmon and sardines sold in the U.S., checking each for the omega-3 fatty acids DHA, EPA and DPA, as well as omega-7 fatty acids, and for contamination with mercury, arsenic, lead, and cadmium. So which products on the market provide the highest amounts of omega-3s with the least contamination? White Plains, New York, JCanned and packaged tuna, salmon and sardines can be an excellent source of omega-3 fatty acids, but some may also be contaminated with toxic heavy metals such as mercury and arsenic.
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