Confusion sometimes swirls about calcium supplementation and kidney stones (calcium oxalate). Well, calcium can actually be protective from kidney stone development. Drs. Oz and Roizen discuss this in their column that ran on January 16, 2012. You can read it at their
website as well. Calcium may actually protect patients prone to forming kidney stones from kidney stones development.
Another author, Curhan, also explains that calcium doesn't form kidney stones.
Read his article too.