About 15 million folks in the U.S. take proton pump inhibitors or PPIs such as Prilosec and Prevacid annually. They ease the discomfort of reflux and GERD by reducing the amount of acid your stomach cranks out. That’s sweet relief for sure -- but long-term use may cause kidney disease, bone fractures, pneumonia, vitamin B12 deficiency and Clostridium difficile-associated diarrhea. And now you can …