Interestingly, I have read that peppermint oil actually helps improve stomach acid. I have taken one HCl with my PO in order to prevent the enteric coating from dissolving in my low-acid stomach. This has proven to be a very effective 'trick', and has made using the PO even more effective in my situation. The brand I use, Dr. Murray's Natural Factors, contains caraway and oregano oil. I like the results, but have also begun a course of Grapefruit-Seed-Extract to ensure that all affecting microbes in my small intestine are being sufficiently reduced. I am complementing the therapy with kombucha tea and probiotics.