"Keep in mind, too, that as storage time increases, the probiotic content decreases."

Yogurt has got to be the simplest thing to make. And it costs about 25% of what store bought costs. Get a yogurt maker (they're cheap!) or dehydrator or smart pressure cooker - all can be used. With a smart pressure cooker all yo have to do is add the milk, let it run through its sterilization cycle and then add starter - just some yogurt from your last batch. That's it, in 8 hours you are done and can our it into jars. $2 for 8 full cups of yogurt that would cost you $10 in the store. Plus since you can make it every week the probiotic content is at its highest all the time.