These juice extracts of grain greens seem to offer an energy lift and act as a "purifier" and "rejuvenator," probably because of their chlorophyll and nutrient content. That, at least, is what users state. But these grasses may also help protect against cancer, and chlorophyll, as an antioxidant, can have an antiaging function. Barley grass has recently been studied in Japan and been shown to protect human cells and animal DNA from damage by X-rays and some cancer-causing chemicals. Of course, this effect was seen when the grass juice was given prior to exposure. This preliminary evidence suggests some possibilities. Along with the other nutrients available in wheatgrass or barley grass, these juices may be very useful in healing and disease prevention. There is a lot of enthusiasm about them in certain areas of the health community.