There are so many websites that give info on Prebiotics and Probiotics. I know they sell Probiotics in many supplement form, but I want to avoid. If I'm not mistaken, Prebiotics is food for good bacteria in your stomach and intestines. Example is garlic, onion, leeks, bananas. Probiotics is the actual good bacteria. Example is Yogurt and other fermented food. I heard if you eat too much Probiotics, it eats the lining of your stomach and intestines, hence causing pains, ulcers. So it is important to have balance of Prebiotics and Probiotics. But is Yogurt really a good source of Probiotic, or does good bacteria have to be added to it. Can you clarify.