Antacids are a billion dollar industry in the US alone. These bacteria are naturally found in your intestines and digestive tract. If you could eat and save yourself the stress of thinking about contracting one or more of these wouldn't you do it?
As the cultures grow and multiply, immune, digestive and vaginal health should improve. Maybe it gave them a bad side effect or maybe it was discontinued where they normally purchase it. Always, check for their dates, if it is expired it may cause more harm to you than good. The supplements can be a good choice for people who are taking antibiotics.
There are several probiolite products on the market today with a guaranteed high count of appropriate 'good bacteria'. For example, Bifidobacterium infantis is a great probiolite species for children, and is thought to play a key role in immunity. They are naturally found in yogurts and are often consumed in order to alleviate bowel disorders.