I have tried both psyillium and oxy cleanses. Both do not work in long run.
Yoga does help in strengthening the internal organs be it liver, kidneys, intestines, heart, lungs etc. Its free and available to all and if done correctly has no side-effects.
I would be very careful of doing these cleanses. They can actually be harsh on the body and put a dent in our pockets ( considering the cost of all these supplements). I have been there, done that.