Vitamin D is an important nutrient for good bone health, but many Americans are getting way too much of it.
A new study shows some adults taking more than 4,000 units of Vitamin D every day, which is way above the dose of 600 units recommended for those 70 or younger.
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It's also far above safe levels.
Experts aren't certain of the impact of long-term high-dose Vitamin D, but some studies suggest it can cause excess calcium in the blood, leading to deposits in blood vessels.
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