Luckily for most families, this scenario rarely happens. Johnnie, his parents and grandparents are still not getting enough daily calcium. So fortifying products with calcium does make some sense. But never forget that too much of anything can be as dangerous as none at all. The suggested upper limit is 2,500 mg daily.
Excess calcium can harm renal function and can cause kidney stones.
Certainly people who have suffered from a kidney stone should be particularly careful of calcium excess. First of all, take a history lesson. History has proven that Mother was right years ago about milk. She's still right today. And milk not only provides calcium, but also other important nutrients such as riboflavin, vitamin A and D and magnesium.