In the past, there has been some concern expressed around the vitamin A content of Cod Liver Oil.
This concern stems from the fact that almost all cod liver oil products on the market are supplemented with added vitamin A (natural or synthetic) because many so-called cod liver oil products are not actually made from cod! Many brands use fish body oil (from species such as pollock or haddock) as a less expensive source of oil, and then add vitamin A and D to mimic cod liver oil.
So Why Can They Do This?
This practice is allowed because the international production of cod liver oil is regulated by only one rule—the final product must merely match the specific EPA ratio (EPA to DHA) found in cod liver oil (not relevant to their vitamin content).
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