* oily fish, like mackerel, herring, sardines, anchovies, salmon, and pilchards
* Omega 3 fish oil supplements
* fresh or frozen tuna
are available but check to make sure that your supplements are not made from fish livers. The liver can contain high amounts of retinol vitamin A, which has been linked to birth defects. Omega-3 supplements not derived from fish livers but rather from the body of the fish are less likely to contain this type of vitamin A.