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Spinach is one of the best food sources of calcium there is (and other leafy greens are a close second). To compensate, your body will take calcium from your bones to keep your blood calcium levels where they need to be. Over time, this can weaken your bones and lead to osteoporosis.he Best Food Sources of Calcium. Contrary to popular belief, dairy foods are not the only sources of calcium. Here are some of the best food sources of calcium out there, including not only dairy foods but a range of others as well: 1  Spinach. 2  Turnip greens. 3  Mustard greens. 4  Collard greens. 5  Blackstrap molasses. 6  Swiss chard.
Dark greens and broccoli are also good sources, but to get your daily allowance, you'd have to eat between 6 and 20 cups of them. Finally, if you do opt for a calcium supplement, a reasonable dose would be 500 mg per day in divided doses of calcium citrate, which is more easily absorbed than other forms of calcium.