It is used as a medicine as well as a supplementary diet
Wheat grass vs. common vegetables
"Fifteen pounds of wheatgrass is equal, in overall nutritional value, to 350 pounds of ordinary garden vegetables"
Wheatgrass is believed to be superior to other vegetables in its content of Vitamin B12, a vital nutrient, though the vitamin is not contained within wheatgrass but is a byproduct of the microorganisms living on it.
Another common claim for wheatgrass is that it promotes detoxification