For one, thats what the company recommends. They are bacteria that eat other bugs and they do their best in those conditions. Also if you’re prone to sibo, it makes it more likely to become overgrown with the bacteria you are taking. These guys can take the acid, dont worry about that, but your stomach ph is lowest when there is food in it, especially protein, fyi.
They are literally soil based bacteria strains. Alot of manufactures use them but I like prescript assist because of the high strain count, which makes it less likely for bugs like candida to adapt. If you still have an overgrowth, you will probably experience some die off the first few days.
The japanese have studied a couple of those strains and showed that they supported lactobacillus and bifido numbers.