Not one problem. It's far nicer to my stomach than drinking litres of cider every day. I used to have to take antacids every day, but now I've cut down on my drinking, and still take a lot of G, I don't need them at all. I wouldn't worry.5eriously ha5 nobody experienced any 5tomach problem5 from u5ing it? I'm afraid that it i5 5lowly and 5urely eroding my in5ide5