Threelac is a god product but you can use something better.
What is wrong about Threelac is the claim you don't need to stick with an anticandida diet for it to work.
Bacillus Subtilis and E. Fecalis have shown antifungal activity during "in vitro" experiments. Combining Threelac with an a Rx antifungal such as Nystatin may give you better results. However, you can treat your intestinal overgrowth with Baker Yeast or S. Boulardii, and you don't need to expend the money Threelac cost. Also, treating the intestinal growth with Baker Yeast will give you some benefits the Threelac bacteria won't do.