In general, it appears to be preferable to get most of your calcium from foods which contain it naturally, and to restrict the amount you get from supplements (including calcium-fortified drinks and foods like orange juice, soy milk, almond milk, and even calcium-fortified milks like certain lactose-free milks
— which are like taking a supplement with food). For example, getting too much calcium from supplements
has been associated with an increased risk of kidney stones, heart attack and death in women, and an increase in the risk of heart attack in men. Taking calcium supplements has also been associated with an increased risk of dementia in elderly women who have evidence of cerebrovascular disease or who have a history of stroke. Nevertheless, calcium from all sources counts toward the upper tolerable intake level (UL)
above which the risk adverse effects increase — although it is rare to exceed this limit from food alone.
If you are considering taking a calcium supplement, be sure to calculate how much calcium you are already getting from food
, and from other sources, such as over-the-counter antacids
, and then only supplement with the amount you need to meet the recommended daily intake
. For more about getting the right amount of calcium, sources and different forms, and our tests of popular products, see the Calcium Supplements Review >>
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Is it important to take calcium and magnesium together? >>
Are plant-based calcium supplements, like AlgaeCal, better than regular calcium supplements? >>