Sorry I totally disagree with everything you said ! You have been greiviously misinformed!
The majority of people are highly calcium deficient and calcium oxide is the least beneficial form of calcium!
But you are not alone, a huge surplus of misinformation permeates the bought and paid for media and also many at these forums!
The problem lies in absorbing calcium properly, a light food acid is required for proper absobtion this is why oyster shell calcium come with vitamin D a light acid and this is why one consumes lemon juice or apple cider vinegar with calcium hydroxide!
There is much that is misunderstood about calcium and its uptake and some statements that are actually unhelpful and debilitating like your incorrect statements about calcium! I hope people will research beyond these misguided myths before casting aside some of the best procedures there is for returning to good health!
With osteoporosis in epidenic proportions I would hardly take you statement that people have too much calcium seriously ! The statement is ludicrous!