Do not exceed 2 servings per day without the advice of your health practitioner. Or take 3 - 4 caplets per day. Each person has different nutritional needs, which need to be assessed by each individual. However, beet juice can have a strong effect on some individuals when they incorporate it into their diet for the first time. For this reason, it is suggested that people take the recommended amount at first and increase gradually.
Beets contain a wide range of nutrients.
Of course the amount of nutrients in any natural food are going to vary from harvest to harvest, even between two plants growing right next to each other in the same field. All red beets, though, do contain a wide spectrum of vitamins, minerals, and enzymes. They are found, however, in an organic form, where they have been assimilated into the plant. When they are captured during the juicing process, they remain in a form that is much easier to assimilate than, say, synthetic nutrients. The iron in beet juice, in particular, is noted for being much more assimilable than man-made forms of iron.