You get lots of calcium in many foods.
OJ, skim milk, and many other foods, (vegetables galore) have OODLEs of CaO in them. No need to load up with calcium.
Osteoporosity is NOT caused by lack of calcium in the diet. It is caused by TOO MUCH fatty acid in the food of the wrong kind, such as margarine and vegetable oil -- and not enough D3. If you take calciferol, and swear off vegetable oil and simple carbohydrates, you can forego the elemental calcium entirely.
D3, which is usually deficient in northern climes because people don't get enough sun, causes an increased absorption of calcium, which is what you want, not loading up on the stuff.
Too much calcium will cause calcium deposits, ringing in the ears, cracking of joints, and heart problems. Calcium ions are indicted in combining with apoliprotein b to form arterial plaque. They do this strangely enough in what is similar to an allergenic or histamine reaction, coursing along calcium channels in the artery walls in response to arterial signals precipitated by by endothelial damage. Hence the usage of "calcium channel blockers" to bring blood pressure down.
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