Over-the-counter dietary supplements are a huge business in the US, aggressively marketed. Many people take them even if they have not been diagnosed with any particular deficiency but because they have the vague belief that if something is good for you, then more must be better.
But the benefit of taking such supplements in the absence of a specific need is doubtful. The results of a new study adds to the list of dietary supplements that do not seem to provide any benefit, in this case vitamin D and calcium.
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