One serving of milk contains many of the essential nutrients your body needs, including:

References:
USDA FoodData Central online at fdc.nal.udsa.gov. Mean values calculated from database.entries across all fat levels of plain vitamin D-fortified fluid milk in Legacy, Foundation, and Survey (FNDDS) data sources. The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

*Source:
USDA FoodDate Central. FDA's Daily Value (DV) for potassium of 4700 mg is based on 2005. DRI recommendation. In 2019, NASEM updated the DRI to 3400 mg. Based on the 2019 DRI, a serving of milk provides 10% of the DRI. FDA rule-making is needed to update this value for the purpose of food labeling.