Wheatgrass is a nutrient-rich type of young grass in the wheat family. It's sold as a dietary supplement in tablet, capsule and liquid forms. Wheatgrass is often used for juicing, or added to smoothies or tea.ome proponents tout wheatgrass as a treatment for cancer, anemia, diabetes, constipation, infections, skin conditions, ulcerative colitis and joint pain, among other health concerns. However, there are few research studies about wheatgrass, so it's difficult to assess such health claims.