Why Too Much Vitamin D Can Be Harmful

2012-05-30 08:04

Much of the news about vitamin D revolves around making sure people get enough of the sunshine vitamin and warning everyone about the health hazards of being vitamin D deficient. But it also turns out that taking too much vitamin D can be harmful, and a new study from Copenhagen explains why.

Too much vitamin D can be dangerous

There's no shortage of studies concerning the benefits of vitamin D and the health risks associated with having low or deficient levels of the nutrient in your blood stream. Low levels of vitamin D have been associated with a wide range of health problems, including depression, severe asthma in children, and Parkinson's disease.

Perhaps the most commonly recognized benefit of vitamin D is its role in making sure calcium reaches the bones to support and maintain bone health, while a vitamin D deficiency is associated with osteoporosis and higher risk of fractures. In fact, research also suggests that higher than normal levels of vitamin D are necessary to ensure the effectiveness of bisphosphonates, which are drugs taken to boost bone density.

On the other hand, some previous studies have suggested that taking high amounts of vitamin D may be harmful. This new large study from the University of Copenhagen highlights the dangers of taking too much vitamin D.

How much vitamin D is too much?
The study involved an evaluation of 247,574 blood samples from the Copenhagen General Practitioners Laboratory, part of Denmark's civil registration system. When the investigators correlated vitamin D levels with mortality, they discovered the following:


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Totally worthless article. "50 nmol/L" Are you kidding? At the very least the writer could have given us the dosage used in the studies in language we can understand like 1000 mg per day.
The 50 nmol/L is how vitamin D is measured in the blood when you get a blood test to determine your vitamin D status, so this is definitely a useful figure. A vitamin D blood test does not give you a dosage--the dosage, which for vitamin D is in International Units (IUs) would be determined by your doctor so you could then bring your blood levels of vitamin D up to a healthy range, and the range is measured in nmol/L.