I dont know, before i would have agreed 100%. But i tried one of those 7 day cleansers after about 3 years of avg. daily smoking, and i was clean after 25 days abstained. Im 210 and 5'8 so, thick but not a fat ass. I spent over $100 and i am convinced it works.
So-called "7 day cleansers" and all other detox drinks work on the principle of dilution - because water is consumed with the product as instructed by the maker. As I stated before, all youre doing is merely diluting your THC concentration so the sample registers below the test cutoff limit. About the only effect those drinks have is providing color. Those overpriced magic drinks DO NOT remove or dissolve THC metabolites, as the makers lead you to believe. Its the water and vitamin content of the magic drink that does the whole trick. You could duplicate the same actions and save a ton of money by following the Dilution Guidelines posted on this forum
It makes you excrete burning hot fesces, and we should know that more thc metabolites are actually expelled in solid waste rather than urine.
And you should know that even when THC is being excreted via the stool, that will still not stop the kidneys from filtering THCA from the bloodstream and depositing into the bladder for the eventual exit.