The charcoal also prevented healthy bacteria from being damaged
The researchers also took their experiment one step further and analyzed the bacterial species that were present in the large intestines of their volunteers. They did this by taking samples and actually analyzing any DNA present to identify specific species of bacterial strains. They found that the moxifloxacin would decrease the diversity of DNA found, meaning a lot of the bacteria that are normally present were killed. The diversity was decreased by almost half! Those who took the antibiotic with charcoal, however, only saw a decreased diversity of about 3%. That's a great reduction! However, it still proves that the protection is not quite 100%.