I take a prebiotic along with probiotic. It says in the adverts ( Angela Ripon) that even if you look thin you can have internal fat that prebiotics help to break down. It’s like food for the probiotic. I’ve had digestive problems all my life and wish there had been as much information in the past as my digestive system has governed my life for years. One article I read said to take a probiotic that has to be kept in a fridge as they’re better. When I first started taking the prebiotic I did have awful stomach pain for a while, which, I suppose, shows that it was doing something. I think I should have started off with a tiny amount. I now take a pre biotic, probiotic, have kimchi and kefir most days. The prebiotic insulin is also supposed to help with sugar spikes, too. And, if you take it at night, helps you to sleep. Steph McGovern either made a programme about it or did a podcast and Michael Mosley did a podcast about prebiotic inulin. Mind you, because of covid etc I still haven’t made any long journeys or gone on any protest marches to test how much my digestive system has improved!