Our stomachs have mass colonies of bacteria that are known as microbiomes. These help us with both digestion and general health. Traditionally, we have thought that taking over the counter probiotics could help the average person maintain this gut health. However last week two studies revealed that this might not be the case, and in some cases it might even be harmful. We spoke to Dr Dan Worthley, a Beat Cancer Research Fellow at the University of Adelaide and the South Australian Health and Medical Research Institute.