It’s quite a sensitive & complex subject, as such we will do our best at providing a clear and concise article to clear any doubts you may have.
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Answer From Katherine Zeratsky, R.D., L.D. Vitamin D toxicity, also called hypervitaminosis D, is a rare but potentially serious condition that occurs when you have excessive amounts of vitamin D in your body. Vitamin D toxicity is usually caused by large doses of vitamin D supplements — not by diet or sun exposure.
That’s because your body regulates the amount of vitamin D produced by sun exposure, and even fortified foods don’t contain large amounts of vitamin D.
The main consequence of vitamin D toxicity is a buildup of calcium in your blood (hypercalcemia), which can cause nausea and vomiting, weakness, and frequent urination. Vitamin D toxicity might progress to bone pain and kidney problems, such as the formation of calcium stones. This level is many times higher than the U.S.
Recommended Dietary Allowance (RDA) for most adults of 600 IU of vitamin D a day. Get the latest health information from Mayo Clinic’s experts. Sign up for free, and stay up to date on research advancements, health tips and current health topics, like COVID-19, plus expertise on managing health.
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1. Elevated Blood Levels
Even though toxicity is unlikely if you keep your daily intake levels below 10,000 IU per day and avoid excessively high intakes of vitamin D supplements, experts recommend that people with typical vitamin D levels do not exceed 4,000 IU of vitamin D per day Keep in mind that people who are low or deficient in vitamin D typically need to take much higher levels than the current Tolerable Upper Intake Level (UL) of 4,000 IU per day to reach and maintain optimal vitamin D levels. This will help you avoid potential inappropriate or dangerous dosing.
Summary Vitamin D levels greater than 100 ng/mL may be harmful.
Symptoms
vitamin D can cause abnormally high levels of calcium in the blood. This can affect bones, tissues, and other organs.
You probably aren’t getting too much vitamin D from the foods you eat or from exposure to the sun. And there has been an increase in overall hypervitaminosis D cases in the past few years. It is usually due to taking more than the recommended daily value of vitamin D. If you take a multivitamin, look at the amount of vitamin D in it.
Some prescription medications used to treat high blood pressure (thiazide diuretics) and heart diseases (digoxin) can cause an increase in vitamin D in the blood.
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