I know all that....<quoted text>
No, I am not talking about C. I am talking about citrate.
Look it up. Google citrate and kidney stones. Its one of the few things clinically proven to reduce risk for oxalate stones.
I thought you'd confused Vit C with citric acid when they're two different chemical compounds. Ascorbate also bonds with Ca^2+( 2+ as valence).
Ok, matter closed.