When you are only consuming juices, whatever your body doesn't absorb passes into your large intestine. This is where it is fermented by bacteria and can cause you to build up stool quite quickly. If you introduce juice cleanse laxatives to lose weight quickly, you could lose too many nutrients in your stool. This can lead to dehydration and imbalanced electrolytes, so we recommend sticking to a plain juice cleanse. It should be enough to eliminate the toxins in your body. [1]