I was only able to complete four of the five days. It is a little tough to take 15 pills in 5 hours, but you do know it is working. Drank the XXtra clean on the day of the experimentation, and now I have a new job! Not a “heavy” marijuana smoker, but I had smoked the night before I started the program (live in Mass, where it is legal.) I WAS skeptical, but it was money well spent!