What I think may happen, is what happens with another electrolyte given in supplement form which may cause problems of another kind too.

Potassium given in supplement form floods the body quickly
and may cause brief overages in the serum.

Giving calcium seems to do this too. With Potassium, excess is temporarily stored in the bowel...to be reabsorbed later. But there is no place for this excess calcium to go, so it becomes spurs on bones, or perhaps lines the blood vessels, or calcifies the organs?

The trick is to normalize Vit D, which will allow FOOD sourced and bound calcium better absorption, along with the balancing effects of magnesium too. Then the calcium will be absorbed slowly and not flood the serum too quickly. Calcium in food is limited and smaller than taking supplements.

I saw an interesting science show on TV... illustrating S.American post menopausal women making their food tortillas with lime powder... they were outside alot and consumed this calcium in this food form daily. And they had NO appreciable osteoporosis or osteopenia. They were getting good sun exposure to provide Vit D to then enhance the absorption of calcium and magnesium from their foods. They also ate lots of beans which are good providers of magnesium.