Not really. Most "detoxes" consist of two things - laxatives and diuretics. So you start excreting more (which can result in weight loss as you lose waste and water), but you're not really "detoxing"...just pushing things along a little faster than they'd otherwise go. In addition, some of the ingredients, particularly in stimulant laxatives from chemical or natural (senna) sources, can result in dependence on those ingredients, meaning that after your "cleanse" you may need those chemicals or ingredients to go.
Some "cleanses" (Dr. Natura is one) have bentonite clay, which basically forms a cast on the inside of your intestines, making it look like you're excreting some really nasty stuff from your insides...but in reality, you're just excreting what you're taking in from the cleanse.
If you want your body to be cleaned out, I recommend eating lots of fresh, whole foods (veggies, fruits, etc) and drinking lots of water. Your body will take care of the rest.
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