Milk is a nutrient-rich liquid that feeds every human being since birth. Its consumption dates back to thousands of years ago when men were able to tame animals and harvest their milk. The liquid contains ample amounts of proteins and minerals such as calcium, phosphorus, magnesium, and potassium as well as various vitamins including A, B1, B2, B6, B12, C, D, K, E, niacin, and acid folic. Nearly 80 percent of the world’s milk is obtained from cows.