Wheatgrass is a kind of grass.The aboveground parts, roots, and rhizome are used to make medicine. Wheatgrass is often used as a source of nutrients. It contains vitamin A, vitamin C, vitamin E, iron, calcium, magnesium, and amino acids. People use wheatgrass for conditions such as a blood disorder that reduces levels of protein in the blood called hemoglobin (betathalassemia), high cholesterol, a type of inflammatory bowel disease (ulcerative colitis), and many more