I had decided to try this product because of other preparations according to other customers of the live test was negative. So I conducted with Dr. Wolz intestinal flora plus select a similar test: overnight I had two glasses of milk are in the I did a little milk yogurt, in the other the contents of a capsule intestinal flora. The next day, not only the yoghurt milk was thickened, but also in the glass with intestinal flora also a yogurt had formed, but something tasted different (because yes, other bacterial cultures are). This shows that the bacteria in this preparation are still alive, so also multiply in the intestines and should show the desired effect of intestinal colonization.