Our expert says:
I would think that a product like the Salmon Oil which is made under very strict Quality Control, would be tested for contaminants such as heavy metals which I think you are referring to. The Salmon oil is still the best source of the most important omega-3 fatty acids, namely DHA and EPA. If you take flaxseed oil (which could theoretically be contaminated with pesticides and herbicides!), it contains alpha-linolenic acid (ALA), which your body will have to convert to DHA and EPA. I can't say what quantity of ALA is required to produce the same amount of DHA and EPA as is found in a 1000mg capsule of the salmon oil, but because of the need for conversion, I would surmise that you would need to take large doses.
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