There is an invisible universe hidden inside your body, it's called the gut microbiome -- a vast array of trillions of intestinal bacteria, hundreds of different species. They help digest your food in exchange for a warm, safe place to live. And we are only now starting to discover the gut microbiome plays a much larger role in our lives than we ever imagined.

Some of those bacteria found inside us are replicated in commercially manufactured mixtures called "probiotics." You see them on grocery and pharmacy shelves, and they're recommended by your friends and often, by doctors like me.

But do probiotics actually do anything?  To find out, first you need to know about the gut microbiome.

Dr. Jeff Gordon: This is a snapshot of the microbiome.

Dr. Jon LaPook: And then this is the trillions of bacteria there. They're represented by the different colors.

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