Taking a probiotic with several different strains of healthy bacteria can reduce uncomfortable symptoms such as gas, bloating, cramps, constipation, and / or diarrhea. (mindbodygreen.com)
Keep in mind that each probiotic does something a little different, so a probiotic with only one strain of bacteria likely won't have the same effects as one with several different strains. (ipupster.com)
Most of us assume that all lab rats are the same, but there are several different strains of common lab rats. (science.howstuffworks.com)