Yes. You can definitely get too much vitamin D. It's a fat-soluble vitamin, which means it can build up in the body if you take too much, which can be dangerous. While not all experts agree (some think we need more), most adults should get 600 international units (IUs) of vitamin D daily.
Adults over 70 need at least 800 IUs of vitamin D a day. Older adults are more at risk of a vitamin D deficiency because their skin is not as able to produce vitamin D from the sun (a major source of vitamin D) and because they tend to spend more time indoors. Also, vitamin D intake tends to be lower in older adults. So they need to take extra steps to make sure they're getting plenty vitamin D to keep their bones strong. Vitamin D is needed to help our bodies absorb calcium, a critical mineral for our bones.
The NIH has set the safe upper limit for vitamin D at 4,000 IU/day for adults. Too much vitamin D can cause high calcium levels. High calcium levels cause weakness and mental confusion, but can also cause dangerous and potentially deadly heart rhythm problems.
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