Calcium is the most common mineral in the human body, where it is present in almost the same relative abundance as in the earth's crust. There are six stable isotopes of calcium; calcium-40 is the most common (97 percent), and calcium-46 the least abundant (0.003 percent). The ratios of the stable calcium isotopes in all terrestrial materials are virtually identical and were determined during nucleosynthesis 4.5 billion years ago. That humans have this same isotopic composition is no surprise, because dietary calcium depends on the isotopic composition of the soil. Calcium is present in variable amounts in all the foods . . .
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Velimir Matkovic (1992) studied this question.
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