Kefir normalizes the bowel flora which may be damaged from
antibiotics and/or inflammation.

For women it can help female discomforts too, over time, like yogurt is supposed to do. That whole area "down there" is linked and improving the bowel flora improves all the membranes there.

I've eaten yogurt for years. It did nothing like Kefir did for me!

There are some medical sites claiming that 70% of human illness links to the GI tract and that restoring this balance is necessary for normal immune functions and nutrient absorption.

For general well being and improvement of nutrient absorption, I think Kefir is well worth it. It doesn't cost alot of money and tastes good if you get the flavored ones.