Remi is right when it comes to eating healthy foods, which means you dont need extra merchandise if your getting your nutrients from raw foods,etc.
With my busy schedule as a student license vocational nurse, i find it quite hard to eat "healthy" and might not get the amount of fiber.
The saying goes if you eat healthy well of course you get all the nutrients, vitamins and minreals from the foods, raw juices, etc. and might not need to do an enema everyday or so often. But on the other hand for someone like myself who sometimes dont meet the required foods, aquazon "algae" and the other three supplies has helped me recover. I wouldnt call it has "substituting" because they are rainforest bio-energetic herbs that balances the meridian:)