Is taking citracal safe if having a history of kidney stones due to lack of adequate calcium supplementation?

Calcium: It may seem strange to take calcium to help prevent kidney stone, but this can be one of the beneficial measures to take to prevent stones. Most kidney stones are calcium oxylate. If you take oral calcium, the calcium binds with oxylate in the GI tract and is eliminated through the intestine. Oxylate that is not bound in the GI tract enters the blood stream and can end up in the kidney.