Fivelac has 40 times as much ENTEROCOCCUS FAECILIS as Threelac. This could easily kill people. Google ENTEROCOCCUS FAECILIS and see what you find. There is nothing good about it. There is no such thing as a good and a bad strain. There is only 1 kind of ENTEROCOCCUS FAECILIS and its bad. Please do your research. You can become immune to Antibiotics and other horrible things from it.