Barley grass is the young leaf of the barley plant (Hordeum vulgare). Sometimes referred to as "barley leaves" or "barley green," barley grass is rich in chlorophyll and antioxidants (such as lutonarin and saponarin), and also contains gamma-aminobutyric acid (GABA), ferulic acid, vitamins, and minerals.1 Zeng Y, Pu X, Yang J, et al. Preventive and therapeutic role of functional ingredients of barley grass for chronic diseases in human beings. Oxid Med Cell Longev. 2018;2018:3232080. doi:10.1155/2018/3232080 Barley grass is used as an ingredient at many juice bars. In addition, natural-food stores often sell bottled juice drinks containing barley grass juice. Some stores also sell kits that allow you to grow your own barley grass for juicing. In Japan, green juices made with ingredients like young barley grass juice are known as "aojiru," and are widely consumed to enhance health.2 Barley grass powder (a dehydrated form of barley grass extract), barley grass capsules, and barley grass tablets are sold in many natural-food stores and in stores specializing in dietary supplements. SEE MORE...