Barley grass offers a variety of health benefits because of the minerals, vitamins, and antioxidants it contains. It has a lot of magnesium, which is the fourth-most-common mineral in your body for energy production and glucose control. Barley grass is rich in vitamins A and C, which act as antioxidants. The calcium found in barley grass supports bone help and can help prevent or reverse osteoporosis. The soluble dietary fiber in wheat grass can help wash extra cholesterol out of your body.