Wheatgrass is a grass that is closely related to wheat. It is a thick, dry grass that looks like hay or straw. The above-ground parts, roots, and rhizome are used to make medicine. It is primarily used as a concentrated source of nutrients. It contains vitamin A, vitamin C, and vitamin E, iron, calcium, magnesium, and amino acids. Wheatgrass contains chemicals that might have antioxidant and anti-inflammatory activity.