Milk is a major source of dietary energy, high-quality protein and fat. It can make a significant contribution to meeting the required nutrient intakes of calcium, magnesium, selenium, riboflavin, vitamin B12 and pantothenic acid. Milk from some animal species can also be a source of zinc and
vitamins A, C, D and B6. Bioavailability of some nutrients in milk, for example calcium, is high compared with that in other foods in the diet.