Is there any health benefits from wheatgrass juice?

Yes. Wheatgrass juice is undoubtedly quite healthy; it is a rich source of antioxidants and magnesium. Proponents of wheatgrass claim it is a panacea for a wide variety of health problems- see http://www.hippocratesinst.org/wheatgrass/benefits-of-wheatgrass Unfortunately, virtually all of these claims are unsubstantiated as there is little research to prove or disprove them. But many testify it helps.