Normalizing blood vitamin D levels optimizes calcium absorption. Increasing dietary or supplemental magnesium intake makes the kidneys more capable of retaining the calcium we need. With sufficient vitamin K in the blood, we use calcium more efficiently to calcify tissues that want to be calcified (bones and teeth) and decalcify tissues we don't want to calcify (such as arteries and tendons).
Research suggests that too much calcium or calcium supplements are a risk factor for calcification of other tissues, particularly for heart disease. 1 It's worth looking at your dietary calcium intake. No research shows that anything above 800 mg of calcium (including diet and supplements) has any effect on bone density. The only research that shows an effect is when combined with vitamin D.
Where to find calcium in food, for example: most green vegetables contain it (broccoli tops the list), sesame seeds (among the best sources of dietary calcium).
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