From Wikipedia:
The human body is naturally capable of maintaining itself, with several organs dedicated to cleansing the blood and the gut.[23] Alan Boobis, a professor and toxicologist at Imperial College London, states:
The body’s own detoxification systems are remarkably sophisticated and versatile. They have to be, as the natural environment that we evolved in is hostile. It is remarkable that people are prepared to risk seriously disrupting these systems with unproven ‘detox’ diets, which could well do more harm than good.
Just saying...