Cod liver oil contains high amount of vitamin D, that may play a key role in maintaining a good brain function in old age, it contains more vitamin A per unit rate, then any other common foods.
Almost three times more than beef meat, the next vitamin source. It was once commonly given to children, because vitamin D has been shown to prevent rickets and other deficiencies of vitamin D.
Apart from cod liver oil omega-3 fatty acids are highly concentrated in other cold water fishes, such as salmon, blue fish, herring, rohu, mackerel, sardines, white fish as well as blue fin tuna.
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