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Study Warns That Too Much Vitamin D Can Be Harmful

June 26, 2017: 12:00 AM EST
Vitamin D supplements are beneficial for bone health, but a new study that analyzed data on more than 39,000 adults finds that Americans may be overdoing it. The number of U.S. adults taking daily vitamin D supplements between 1999 and 2014 increased by more than 17 percent, with three percent of the population exceeding the recommended upper dosage limit. Too much vitamin D poses a risk of adverse effects, including abnormally high levels of calcium in the blood and soft tissue, leading to vascular calcification. The recommended dietary allowance for vitamin D is 600 IU/d for adults 70 years or younger and 800 IU/d for those older than 70 years.
Mary R. Rooney et al., "Trends in Use of High-Dose Vitamin D Supplements Exceeding 1000 or 4000 International Units Daily, 1999-2014", JAMA, June 26, 2017, © American Medical Association
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