The bacteria are not kept alive because there aren’t bacteria. There is just fiber to help the bacteria that you already have. We really don’t know what strains do what, and there are so many different types of bacteria found in the gut, that adding it would not really help. Would just make the product more expensive without any real benefit. All we really know for sure is that you can keep your current bacteria happy by making sure they have enough food to eat. Is no one-size-fits-all probiotic that could even be added because the different ones do different things, and different people would need different things. There’s also the issue that many of them come from milk, so that would not be vegan, and the soil based ones are controversial because not only are they expensive, but they are not naturally found in the body. They can live a lot longer, but they are risky in my opinion. It would be pointless to just throw some soil based ones in there that aren’t found in the body without really knowing what they do.