The supplement I drink is called EleCare. It is an elemental formula for children ages one and up. My nutritionist was a genius in thinking about using that for me (a 63 year old female)because they each contain about 300 calories, taste pleasant, and cause absolutely no gut reaction. Body absorbs enzymes in 20 minutes so you get all the nutrients. I could tolerate them when I had diarrhea and kept dropping weight. They are manufactured by Abbott. You can buy them through their website. Very expensive. Six cans of powder cost nearly $300.00. Your insurance may cover them. Mine does not. But I believe that type of supplementation has saved my hide. You just can’t eat everything you want or large portions with SIBO, so gaining weight has been an issue for me. I drink four a day between meals. Taste pleasant except for the unflavored one. Come in vanilla, chocolate and banana flavors. I add a little cinnamon and vanilla extract to mine. I could not tolerate Boost and those other protein drinks. I can drink these shakes even during the worst flair and get nourishment. Nutrients are broken down to enzymes and your gut absorbs them very quickly before bad bacteria can highjack them. Highly recommend them. Can also look through Amazon but beware of counterfeits.