Wheatgrass is prepared from the freshly sprouted leaves of the common wheat plant. · Wheatgrass is an excellent source of many different vitamins and minerals. It is especially high in vitamins A, C and E, as well as iron, magnesium, calcium and amino acids. · It also contains several important antioxidants, including glutathione and vitamins C and E. · Antioxidants are compounds that fight free radicals to prevent cell damage and reduce oxidative stress.