Though it sounds convincing and it is very good for our guts, but we need more information before we start consuming it. I have read the below and would like to share with you Cathy777 and the rests.
Do not use Kefir if you are taking any medications that is known to suppress the immune system. This is due to the fact that Kefir contains live yeast and bacteria. Our bodies' immune systems control bacteria and yeast in our bodies to prevent infection. If you are taking any medication that decreases immune system function (including those with organ transplants), Kefir will increase your chances of getting sick.