No experience with the 7 day drink, but plenty of experience with testing unfortunately. Past experience with other drinks that claim negative test. The deal is that the others work if they have had a head start. What I mean is that the detox drinks that claim you can pass any test will only work if your system is not real saturated or you have quit smoking 2-3 weeks before the test. I've tested myself at different saturation levels with different products. The only one that will work no matter what is the synthetic stuff at human body temp. Don't sweat it, go with the Quick Fix!