Sally, beet root is simply the bulbous part of the beet that you can buy in any market (not the green leaves or stems).
As for me, I cannot tolerate that much beet root because I have Porphyria, and the high sulfur content of beet root would be bad for me. A small amount, OK, but "lots" not OK.
Early in my marriage my husband tried me on all kinds of juiced things. How many days did I go to work with a belly ache because of this?
Only the reappearance of my husband would make me well, even though he didn't know enough about juicing. Stumble Inn, for sure.