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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 ...
Conditions such as tuberculosis and sarcoidosis can raise blood levels of vitamin D. That in turn spurs the digestive tract to absorb more calcium. Genetic factors. A rare genetic condition called familial hypocalciuric hypercalcemia causes an increase of calcium in the blood. This condition doesn't cause symptoms or complications of hypercalcemia.
Vitamin D supplements are used to treat adults with severe vitamin D deficiency, resulting in loss of bone mineral content, bone pain, muscle weakness and soft bones (osteomalacia). Osteoporosis. Studies suggest that people who get enough vitamin D and calcium in their diets can slow bone mineral loss, help prevent osteoporosis and reduce bone ...
Niacin overdose is unlikely if you take niacin only in the amount prescribed by your healthcare professional. You can't overdose on niacin by eating too many niacin-rich foods. But taking too much over-the-counter or prescription niacin can be dangerous. Symptoms of a niacin overdose include:
The recommended daily amount for vitamin C is 75 milligrams (mg) a day for women and 90 mg a day for men. During pregnancy, 120 mg a day are recommended. The upper limit for all adults is 2,000 mg a day. Although too much dietary vitamin C is unlikely to be harmful, large doses of vitamin C supplements might cause: Diarrhea; Nausea; Vomiting ...
Vitamin B-12 deficiency is associated with dementia and low cognitive function, but it's not clear whether vitamin B-12 supplements might help prevent or treat dementia. Athletic performance. Unless you have a vitamin B-12 deficiency, there's no evidence that vitamin B-12 supplements will boost your energy or make you a better athlete.
Research studies have shown that taking 400 IU or more of vitamin D a day lowers the risk of MS in women. But if you're diagnosed with vitamin D deficiency, it may be appropriate to take up to 50,000 IU a week for up to three months. Once you've reached the recommended level of vitamin D, switch to a maintenance dose.
Vitamin D deficiency — when the level of vitamin D in your body is too low — can cause your bones to become thin, brittle or misshapen. Vitamin D also appears to play a role in insulin production and immune function — and how this relates to chronic disease prevention and cancer — but this is still being investigated.
Serotonin is a chemical that the body produces naturally. It's needed for the nerve cells and brain to function. But too much serotonin causes signs and symptoms that can range from mild (shivering and diarrhea) to severe (muscle rigidity, fever and seizures). Severe serotonin syndrome can cause death if not treated.
Use caution when taking vitamin E and other drugs affected by these enzymes, such as omeprazole (Prilosec, Zegerid). Statins and niacin. Taking vitamin E with statins or niacin, which might benefit people with high cholesterol, could reduce niacin's effect. Vitamin K. Taking vitamin E with vitamin K might decrease the effects of vitamin K.