Yes, a number of fish oil supplements (as well as krill and cod liver oil supplements) contain soy, which may be added as a source of tocopherols and tocotrienols (vitamin E). However, since it is a common allergen, manufacturers are required to list this on the label, under "Other Ingredients."
To find a fish oil that does not contain soy and has passed testing by ConsumerLab.com (which checks for levels of the omega-3 fatty acids EPA and DHA, freshness, and lack of contamination), see our Reviews of Fish Oil Supplements and/or Cod Liver Oil Supplements supplements: Click on the "Ingredients" link in the first column of the results table (under the product name), which provides a complete list of ingredients for each product.
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