Regarding use of calcium supplements, which of the following is true?
A. Intakes over 500 milligrams of calcium per dose may interfere with absorption of iron and zinc.
B. For maximum absorbability, any form of calcium supplements should be taken between meals.
C. Supplements containing oyster shell and dolomite are safe to use if they are labeled as "purified."
D. Exceeding the RDA for calcium is beneficial for bone health.
Answer: A
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