Calcium and Vitamin D: Milk is a rich source of calcium and is often fortified with vitamin D, both of which are vital for strong bones and teeth and may help prevent osteoporosis. Protein: It's a complete protein source containing all nine essential amino acids, which are necessary for building and repairing tissues, muscles, and skin. Other essential vitamins and minerals: Milk is packed with other nutrients including potassium, riboflavin, and vitamin B12, which support various bodily functions. Phosphorus and Magnesium: These minerals work with calcium and vitamin D to support bone health.