Yes they do help, look it up what they do. They will help to rid your body of toxins, not just in the blood or urine, you really need to be careful if you do strenuous exercise and you have a slow metabolism, and don't normally exercise. It will bring out all the toxins faster and show higher levels when you are flushing...did you also know that your brain is the fattest part of your body? So, if pot stays in your fat cells, where would they most likely be? Research it, find out....