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Long Term Use of High Dose Vitamin D May be Safe, Study Suggests

Previous research suggests that too-high doses of vitamin D may lead to toxicity. However, a recent study suggests that taking high doses of vitamin D over the long term is safe.


Participants in the study included 5,108 people between the ages of 50 and 84 who were given either a high-dose vitamin D3 supplement (100,000 IU vitamin D) or a placebo monthly for an average of 3.3 years. The researchers administered a blind coded questionnaire that included an open-ended question about adverse events attributed to the supplement.


At the conclusion of the study, 419 participants (16.5%) taking vitamin D and 399 (15.8%) taking the placebo reported more than one adverse event. The difference is not significant.


Researchers from the University of Auckland led the study. It was published online ahead of print on August 3, 2018, in Clinical Nutrition.


Vitamin D can be found in milk, fortified cereals, fish, and eggs. Your body also processes vitamin D from the sun, but it becomes harder for our bodies to process it as we age. A high-quality vitamin D supplement is always a good option if you feel that you’re not getting enough through diet and sun.

Previous article Many College Basketball Athletes Have Low Vitamin D Levels

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