I tried Threelac about 3 years ago. About 6 months before I decided to get it I was just starting a diet. After 6 months I had lost 10 lbs and gained it back while still on the diet. I was also exercising, still i was fat. I was very sad because I couldn't lose weight. I started to search and I found Threelac. I too thought it was expensive and I still do. I bought one box of it. After a month I started to lose weight and my awful periods got better.
I just put this together in my mind just yesterday after reading a book called Probiotics Nature's Internal Healer's by Natasha Trenev: I had been lactose intolerant probable all of my life. After consuming dairy products I would get gas, bloating, dirreah, you know, the works. After taking Threelac I could eat dairy for the first time without taking and lactaid and not getting sick.
For my vaginal yeast infection, Threelac did nothing. Now I am taking Dr. Natura's Colonix colon cleanse. I can see the candida in my stool when I go to the bathroom. I think this is much better than threelac but non the less, Threelac did help me. Good luck on whatever you decide.