I had been suffering from BO for 20yrs and finally I noticed that the odor that was present the most was the sour smell. I connected that with diary products so I start taking enzymes for dairy and it worked. after two weeks the odor was gone. I also took the test and my dr said I was 20times over the amount allowed. Think about it...I couldn't digest dairy foods so every time I had them, it turned to bacteria in my gut and after years of this buildup I got a bad odor. How nice after all this time it was simply Lactose intolerance. PS the bacteria also gave me a peptic ulcer.