He is correct. Probiotics are meant to for short term use only. They help to fill you gut with new microbe that were taken away by antiobics and other germs that are nasty to your good bacteria. Probiotics live only for a short while and eventually are gotten rid by your body's defense mechanisms. What you want to do is fill you GI tract with good clean fruits and vegetables that have the prebiotic nutrients on them and in them so that you gut can fill up on them and use them to fight off the germs/bad bacteria that fill your GI tract on a constant basis. Only occassionally, do you need to have a good and expensive probiotic (refrigerated kind) that will help you when you have a GI Distress. This will help with the GERD, diarrhea, wrong food you ate that caused an upset stomach. Physicians are now giving probiotics along side antibiotics because they know that one helps the other in the gut. This should be the cardinal rule. It wasn't always that way years ago.