casein is the protein in milk....whey is the liquid from milk....I have an idea....how about drinking some milk! ...
Cow's milk, the basis for all other dairy products, promotes strong bones by being a very good source of vitamin D and calcium, and a good source of vitamin K--three nutrients essential to bone health. In addition, cow's milk is a very good source of iodine, a mineral essential for thyroid function; and a very good source of riboflavin and good source of vitamin B12, two B vitamins that are necessary for cardiovascular health and energy production.
Cow's milk is also a good source of vitamin A, a critical nutrient for immune function, and potassium, a nutrient important for cardiovacular health.
Milk produced by grass fed cows also contains a beneficial fatty acid called conjugated linoleic acid (CLA). Researchers who conducted animal studies with CLA found that this fatty acid inhibits several types of cancer in mice. In vitro (test tube) studies indicate this compound kills human skin cancer, colorectal cancer and breast-cancer cells. Other research on CLA suggests that this beneficial fat may also help lower cholesterol and prevent atherosclerosis.
Read on... http://whfoods.com/genpage.php?tname=foodspice&dbid=130