I think if you include a fair amount of dairy foods, in your diet, it's better than supplements anyway. I did read somewhere that calcium tablets can cause gallbladder stones.
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Research has shown that the more animal proteins we consume, the more calcium we excrete through our urine. Ironically, countries that have the highest calcium intake through animal proteins, also have the highest rate of hip fractures. Consuming calcium through plant proteins, the loss of calcium in urine is 50% lower.