Whey Protein Concentrate is made from cow’s milk. Mice and hamsters fed whey protein concentrate live 30-60% longer than others fed standard diets or diets containing other protein sources. This may be due to the increased blood levels of glutathione that result from ingesting whey protein. http://www.lef.org/magazine/mag96/96jan2.htm?GO.X=11\&GO.Y=15