In order to successfully make milk kefir beverages, here are some helpful tips:
a young kefir (fermented 12 h to 24 h) is slightly laxative, therefore indicated against constipation for e.g. The kefir is not very thick yet, it has some little bubbles and its taste is not very pronounced;
a medium kefir (fermented 24h to 48h) has already bubbles, it becomes thicker and the taste is comparable to a yogurt one;
a mature kefir (fermented 48 h to 72 h) slightly constipates, and it is rather used in cases of diarrhea.