I have been taking it for as long as I can remember. I mean, seriously, I can not remember not being on it. I did it once a day until this past May, now I do it twice. I love the stuff. It works wonders. They wanna put me on hypertonic too now though, which I'm all for! I get to try it tomorrow to see how I handle it cuz it made my lungs hurt last time I tried it.