@Silwith
The goddess (in chapter 1.1, page 6) says: "It's really strong against toxins, you can kill any poison or bacteria with it.".
Later (same chapter, page 8) he also purges mold which is a fungus and does not fall under any category the goddess mentioned. Seems like this ability might cover all microbiota in addition to poisons.
"Microbiota are "ecological communities of commensal, symbiotic and pathogenic microorganisms" found in and on all multicellular organisms studied to date from plants to animals.
Microbiota includes bacteria, archaea, protists, fungi and viruses"
Only 2/5 microbiotas have been confirmed but even being able to 'only' kill bacteria and fungi, it's akin to someone using water magic to completely destroy a body from the inside.