Bought the fast detox kit. Must say, since this is the website I bought it, the product does what it says. Only 10 days clean, heavy user, passed test. Lots of sugar in the drink so got some ulcers on my mouth a little, blood pressure was up a little, but maybe that was from the stress of it and finally, the line that appears on the home test is slightly faint but visible which is passing. You go from not passing at all, to taking the QCarbo and then 2 - 2.5 hours later, the line appears out of nowhere. It's amazing, I couldn't believe it myself. You must follow the instructions exactly and maybe even add a little extra water too and you should be good, oh and also, gotta stop for at least 10 - 14 days to see the line you need to pass.