Grace is a vegan. She is trying to increase her intake of calcium and vitamin D by taking a dietary supplement. How can she determine whether it contains enough of these nutrients to meet her needs but not so much that it will cause toxicity?
A. She should select a supplement that contains half of her recommended intake of calcium and vitamin D.
B. She should select a supplement that contains at least 100% of the recommended levels.
C. She should select a supplement that contains no more than 100% of the recommended levels for calcium and vitamin D.
D. She should not take any supplement at all since she is not deficient.
Answer: C
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