Feb 20, 2025 · Vitamin D toxicity is a rare condition that happens when too much vitamin D is in the body. The condition can have serious effects on health. Another name for it is hypervitaminosis D. …

Mar 21, 2025 · Vitamin D is a nutrient the body needs, along with calcium, to build bones and keep them healthy. The body can absorb calcium only if it has enough vitamin D. Calcium is a major part of …

Sep 19, 2025 · The kidneys take vitamin D and change it into a form that the body can use. If the kidneys don't work the way they should, the amount of vitamin D that the body can use may go …

Feb 26, 2025 · Research suggests that vitamin D has a positive effect on the immune system. Experts need to better understand how vitamin D might affect MS. There's also an association between …

Mar 8, 2024 · 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 …

Aug 13, 2025 · Vitamin B-12 supplements also are suggested for women who are pregnant, who are breastfeeding and not using any formula, or who follow vegetarian or vegan diets. Taking high doses …

Feb 20, 2025 · Vitamin C is an essential nutrient, but you can get too much of it. If you're an adult, limit yourself to no more than 2,000 milligrams (mg) of vitamin C a day. The recommended upper limit for …

Apr 17, 2025 · Explore the uses of vitamin A and risks of excess use of this supplement.

May 14, 2024 · When niacin is taken as prescribed for high cholesterol, overdose is unlikely.

May 10, 2025 · And a vitamin D deficiency is a risk for people who follow an eating pattern that doesn't include foods with vitamin D or for people who have limited sun exposure. Foods high in vitamin D …