There are more microorganisms living on and in you than the total number of cells in your body. And a growing body of evidence suggests they are not just along for the ride. More and more studies are revealing the importance of the symbiotic relationship between your gut bacteria and you. Poor microbiome is increasingly associated with health problems such as diabetes, cancer and even depression. Probiotic supplements contain live bacteria that survive digestion to take up residence in the gut. So does this mean they can be used to improve your microbiome?