Ask the expert: Is it possible to get too much vitamin D?

By Michael W. Rosen, M.D.

Q: I keep hearing about the health benefits of vitamin D. But, isn't it also possible to get too much? 

Yes — that's right. With vitamin D, as with many other nutrients, you don't want too little or too much.

Vitamin D helps your body absorb calcium, which you need for strong bones. And, some research suggests it's good for you in other ways, too. For example, it may offer protection against some serious conditions, including cancer, diabetes, heart disease and depression.

But, again, more isn't always better. When people take vitamin D supplements at levels higher than recommended, it's risky. Over time, too much vitamin D can raise the level of calcium in the blood, which may harm the heart and kidneys.

Am I getting enough?
Whether you need extra vitamin D is a good question for your doctor. The answer may depend in part on how much you're already getting. You can get this vitamin from your diet, supplements — and the sun, as well.

Your body creates vitamin D when exposed to sunlight. It only takes about 10 minutes of sun exposure a few times a week to make enough. But, since this also exposes you to cancer-causing UV rays, some experts believe it's not a healthy way to get it.

Some foods that have vitamin D are salmon, tuna, egg yolks and a wide variety of fortified foods.

Before taking extra vitamin D — or any supplement — talk with your doctor. He or she may suggest testing your blood level to determine if a supplement is needed — and if so, in what amount. 

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