Scott's Emulsion "...checks the wasting away of children and adults and restores or creates flesh and vigor...." Visual motif: Shows a little girl reclining against pillow, nestling three kittens; a small dog peering over her shoulder from behind. Cod liver oil is a nutritional supplement derived from liver of cod fish. Cod liver oil also contains vitamin A and vitamin D. It has historically been taken because of its vitamin A and vitamin D content. It was once commonly given to children, because vitamin D has been shown to prevent rickets and other symptoms of vitamin D deficiency.