I've been using the Dr. Schulze products for years with excellent results.
I can also echo that he does encourage you to learn to make your own formulas and tinctures. When I had more time I was making his SuperTonic at home; it's easy to make.
The Formula #1 is to get the colon moving. Not just a laxative, some of the herbs in it are designed to prevent cramping, gas and improve bowel tone. Most people have clogged up colons. I was just talking to some friends about this and when I said they should be having 3-4 bowel movements a day they scoffed and looked at me in disbelief. I say, you're eating 3 meals a day and the colon is designed to extract nutrients and expel the rest. If you're eating 3 meals a day and having one B.M., then you're holding on to a lot of WASTE.
Formula #2 contains charcoal and Bentonite clay. I only use it when I eat something that makes me feel queasy or bloated, means I've eaten something bad and the #2 helps draw out the toxins and get it out.
I believe there's also a Formula #3 which is a kind of fig syrup, more designed for children.