This document discusses vitamin E. It notes that plants are a rich source of vitamin E, listing several plant sources like almonds, barley, sunflower, wheat germ oil, potatoes, and mangos. Vitamin E helps cell membranes by avoiding oxidation of polyunsaturated fatty acids. A vitamin E deficiency can cause issues like exudative diathesis, muscular dystrophy, and encephalomalacia in poultry and white muscle disease and enzootic ataxia in other animals.