Although cod liver oil is more of a supplement than actual food, it is still necessary for a healthy, balanced diet. The oil is extracted from the livers of codfish and is most commonly sold as capsules or liquid. Not only is this oil high in omega-3 fatty acids, but it is also loaded with vitamin D and vitamin A. When using a supplement, read the label carefully. An adult can safely take in about 3000mg of cod liver oil a day but make sure you're not getting too much vitamin A when taking large doses.

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