I have only been taking Bactose for about 2 months. As long as I am taking the pills I have no issues with dairy at all- it's like a miracle! The first month I took it as directed, two each day for one week- my symptoms returned (although milder) a few days after the pills were finished. This time, as suggested by a representative, I am taking one pill per day for two weeks. This has been working well and I'm hoping it lasts the rest of the month. I've been lactose intolerant since I was 18- I'm 50 now- and not having to keep track of my lactase enzymes is awesome! I plan to continue taking Bactose- so worth it!