By Dr. Brian McDonough, Medical Editor

PHILADELPHIA (CBS) – We have heard it many times before: vitamin D can help prevent osteoporosis. But a new study suggests this might not be true.

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A review of 23 previously published studies suggests that unless you have a specific risk factor for vitamin D deficiency it might not make a big difference.

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The researchers looked at blood levels of vitamin D, comparing them alongside the actual bone density in different parts of the body, to see if higher vitamin D really made a difference. There was no real advantage to taking the vitamin D supplements for most people. However not all of the people in these studies were taking calcium which can help with absorption of vitamin D.

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Bottom line, the discussion continues. At this point, most experts support vitamin D especially when it is part of the diet.