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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 ...
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 ...
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.
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.
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.
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.
Answer From Katherine A. Zeratsky and Francisco Lopez-Jimenez, M.D. 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.
A vitamin B-6 deficiency is usually coupled with deficiency in other B vitamins, such as folic acid (vitamin B-9) and vitamin B-12. The recommended daily amount of vitamin B-6 for adults 50 and younger is 1.3 milligrams. After age 50, the recommended daily amount is 1.5 milligrams for women and 1.7 milligrams for men.
A vitamin D deficiency means you don't have enough vitamin D in your body. A lack of vitamin D makes bones weak. But the link between vitamin D and blood pressure isn't clear. In general, vitamin D may change how some body chemicals control blood pressure. The vitamin also seems to keep the lining of blood vessels flexible and healthy.