
Levels of the compound in solution wont be high enough to make your kidneys raise an eyebrow - its all about concentration as your research has shown (good comparison would be between vinegar and Glacial Acetic Acid, the pure form - just the smell of that stuff will strip the roof off your nose !)
In proper use, it just isnt concentrated enough to cause trouble to a multi-celled organism like us; we've evolved to deal with it. Just bad news if you happen to be a uni-celled yeast or bacterium
