Milk is naturally high in protein, as it serves as the primary means for mammals to nourish their young. Protein is present in all types of milk, regardless of the source or classification. Soy milk and other milks derived from plant products also contain protein.
Milk contains essential nutrients for animal and human growth and development. Calcium, potassium, phosphorus, protein, vitamin D, vitamin A, vitamin B12, riboflavin and niacin are the nine essential nutrients contained in milk. With a high demand due to its highly nutritious nature, cow milk has become a commercialized good in the United States and is a good source of nourishment for adults and children.