Do you think that garlic doesn't kill the good bacteria? Some websites say it does, while some imply it doesn't. I don't know what the truth is. As for olive leaf killing the good bacteria, I found this.

"Olive leaf has high concentrations of chemicals, including enzymes and trace elements that have potent anti-microbial and anti-biotic effects. Unlike conventional antibiotics, olive leaf tablets don't destroy gut flora, so there is no need to restore these with acidophilus cultures. Olive leaves are said to perform "selective execution", that is, they kill only the bad
guys and leave friendly gut bacteria intact. "

http://www.iol.co.za/index.php?set_id=1&click_id=31&art_id=vn20040623131454566C270400

I guess this implies that garlic does not destroy lactobacilli

"Fructo-oligosaccharides (FOS, also called "prebiotics") are non-digestible sugar chains that are nutrients for lactobacilli. Some experts believe that FOS, taken by mouth at a dose of 2,000 to 3,000 milligrams, may help the growth of lactobacilli. Natural food sources of FOS include banana, Jerusalem artichoke, onion, asparagus, and garlic."