Wheatgrass powder is low in calories but high in nutrients, including antioxidants such as glutathione, vitamin C, and vitamin E. Antioxidants fight free radicals in the body, reducing oxidative stress and protecting against health conditions like arthritis, cancer, and neurodegenerative diseases. It is advised to consume a glass of wheatgrass juice after you wake up. Twenty minutes after you have taken the juice you can have your breakfast. Keep in mind that wheatgrass juice should be taken on an empty stomach.