I did some research. Some probiotics are strains that do survive the upper GI tract. Brands like Align and Culturelle have been shown to make it thru alive. So has the Florastor yeast Ian mentioned.
It is quite obvious that not all bacteria are the same. Some make it, some don't. Choose wisely
It is quite obvious that not all bacteria are the same. Some make it, some don't. Choose wisely