Nature's Harmony® Norwegian Cod Liver Oil provides nearly 4000 IU of vitamin A and 392 IU of vitamin D per teaspoon. Cod liver oil produced in Norway is the finest in the world with each batch adhering to rigid quality control standards set by the Norwegian government. The oil is tested to ensure the quantity and quality of its vitamin A and D content. Supplementing with cod liver oil may have positive effects on Crohn's disease arthritis inflammatory and respiratory conditions and skin disorders. It may slow the progression of arteriosclerosis and coronary heart disease and is necessary for the proper development of the brain (including intelligence) and nervous system (including visual development) in fetuses infants and children.