I forgot to mention that for intestinal health, you will want to be aware of the need for bulk (something for your digestive system to "chew" on). Flax seed and oil are very good. There are 2 kinds of fiber, soluble and insoluble, ideally, they should be balanced. Cascara Sagrada and Senna can be dehydrating and strenuous, so you want to avoid them at all costs. Check the website for Renewlife. I'm not sure what it is, but try the link at the bottom. You might not even need to be too concerned about your digestive tract, so get better advice at the juicing forum. Tuna fish with the oil may be less irritating than fiber.