Hi, just catching up on Mayoclinic comments. I don't know anything about Caltron book/diet. I discovered the oxylate rich food issue recently on my own, doing research. In addition to that, I discovered an issue with phytic acid interfering with calcium absorption too. My endocrinologist just told me "more calcium" and recommended Reclast because I also have an issue with possible Barretts esophagus. Still holding off/trying to decide what to do. But one thing I read (don't remember where) was to stagger calcium supplements/foods by at 2 hours before or after high fiber, high oxylate foods. Don't know if it's going to work, but I think it's worth a try. Good luck!