I use enterically coated peppermint oil and it does help. I’ve recently discovered a product called Regimint which is enterically coated peppermint and caraway oil. I buy it here: http://www.iherb.com/product-reviews/Life-Extension-RegiMINT-60-Enteric-Coated-Capsules/11268/?p=2
I sought it out based on this study that uses enterically coated peppermint and caraway oils successfully: http://www.altmedrev.com/publications/7/5/410.pdf
I’m not sure if I find it any better than what I had been using. It’s expensive so I combine it with my old one which is enterically coated peppermint, ginger and fennel. I should do a week with just one of them exclusively to see if I notice a difference. The other one is a NOW product and is much cheaper!