However, taking extremely high doses of vitamin D3 for long periods of time may lead to excessive buildup in the body. Because the vitamin is stored in body fat and released into the bloodstream slowly, the effects of toxicity may last for several months after you stop taking supplements 4. Importantly, toxicity isn't common and occurs almost exclusively in people who take long-term, high-dose supplements without monitoring blood levels.
It's also possible to accidentally consume too much vitamin D by taking supplements that contain much higher amounts than are listed on the label. Achieving adequate levels of vitamin D in your blood may help boost immunity and protect you from diseases like osteoporosis and cancer 5. Despite the fact that more people are now taking vitamin D supplements, it's rare to find someone with very high blood levels of this vitamin.
One recent study looked at data from more than 20, people over a year period. The woman was admitted to the hospital after she experienced fatigue, forgetfulness, nausea, vomiting, slurred speech and other symptoms 9. Although only extremely large doses can cause toxicity so rapidly, even strong supporters of these supplements recommend an upper limit of 10, IU per day 3. Toxicity symptoms have been reported at extremely high blood levels resulting from megadoses.
Vitamin D helps your body absorb calcium from the food you eat. In fact, this is one of its most important roles. However, if vitamin D intake is excessive, blood calcium may reach levels that cause symptoms that are not only unpleasant, but dangerous. Symptoms of hypercalcemia or high blood calcium levels, include:. In one case study, an older man with dementia who received 50, IU of vitamin D daily for six months was repeatedly hospitalized with symptoms related to high calcium levels In another, two men took improperly labeled vitamin D supplements, leading to blood calcium levels of What's more, it took a year for their levels to normalize after they stopped taking the supplements Summary: Taking too much vitamin D may result in excessive absorption of calcium, which can cause several potentially dangerous symptoms.
These include nausea , vomiting and poor appetite. One study followed 10 people who had developed excessive calcium levels after they had taken high-dose vitamin D to correct deficiency. Four experienced nausea and vomiting and three had a loss of appetite Similar responses to vitamin D megadoses have been reported in other studies.
One woman had nausea and weight loss after taking a supplement from her naturopath that was found to contain 78 times more vitamin D than stated on the label 13 , Summary: High-dose vitamin D therapy has been found to cause nausea, vomiting and lack of appetite for some due to high blood calcium levels. Stomach pain, constipation and diarrhea are common digestive complaints that are often related to food intolerances or irritable bowel syndrome.
However, they can also be a sign of elevated calcium levels caused by vitamin D intoxication These symptoms may occur in those receiving high doses of vitamin D to correct deficiency. As with other symptoms, response appears to be individualized even when vitamin D blood levels are similarly elevated. In one case study, a boy developed stomach pain and constipation after taking improperly labeled vitamin D supplements, whereas his brother experienced elevated blood levels without any other symptoms In another case study, an month-old child who was given 50, IU of vitamin D3 for three months experienced diarrhea, stomach pain and other symptoms.
These symptoms resolved after the child stopped taking the supplements Summary: Stomach pain, constipation or diarrhea may result from large vitamin D doses that lead to elevated calcium levels in the blood. Because vitamin D plays an important role in calcium absorption and bone metabolism, getting enough is crucial for maintaining strong bones.
Also, some medical conditions can increase sensitivity to vitamin D. A person with any of the following conditions should consult a doctor before using vitamin D supplements:. Most people who have taken too much vitamin D will experience at least two of the following symptoms within a few days of overdosing:. People with severe or chronic vitamin D toxicity may develop life-threatening symptoms, including:.
Vitamin D toxicity can cause a wide range of symptoms, and each individual may respond differently. A person has a higher risk of experiencing toxicity if they have taken supplements over an extended period or taken excessive amounts. This can cause vitamin D to build up in the blood. The risk of experiencing adverse side effects after absorbing vitamin D from the diet or exposure to the sun is very low. Hypervitaminosis D is a relatively rare but potentially serious condition.
It occurs when an individual takes in too much vitamin D. Vitamin D is a…. People get vitamin D from a variety of foods and from spending time outdoors in sunlight. Vitamin D is an essential nutrient that plays a role in many…. People need vitamin D for muscle and bone health. Limited sun exposure and low dietary intake can lead to brittle bones, mood changes, and chronic…. Vitamin D is an essential nutrient, but it can be difficult for people to know if they are getting the right amount.
Some people will be able to get…. Can too much vitamin D hurt you? Medically reviewed by Alan Carter, Pharm. Side effects How common are side effects?
Who should avoid vitamin D? Too much vitamin D Takeaway Few foods contain vitamin D, so many people take supplements. What are the side effects of vitamin D supplementation? Share on Pinterest Hypercalcemia and kidney damage are possible side effects of vitamin D supplementation.
Share on Pinterest Vitamin D toxicity may cause dehydration. How common are side effects? Signs of too much vitamin D. Share on Pinterest Unexplained exhaustion may be a sign of too much vitamin D. Exposure to air pollutants may amplify risk for depression in healthy individuals. Seek urgent medical care for cramping and diarrhea accompanied by severe abdominal or rectal pain, blood in your stool, black, tarry stools or fever.
Also be on the lookout for signs of dehydration such as decreased urine output, dizziness or lightheadedness, thirst, headache and dry, sticky mouth. Nutrition Nutrition Basics Vitamins and Supplements. By Dr. Tom Iarocci. An independent writing and editing professional since , Tom Iarocci received his M. His contributions to cancer research were acknowledged in the New England Journal of Medicine.
Young woman with stomach cramps.
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