The amount of vitamin D you need each day depends on your age. Your immune system needs vitamin D to fight off invading bacteria and viruses. Your muscles need it to move, and your nerves need it to carry messages between your brain and your body. Your body needs vitamin D for other functions too. Together with calcium, vitamin D helps protect you from developing osteoporosis, a disease that thins and weakens the bones and makes them more likely to break. It helps your body absorb calcium, one of the main building blocks for strong bones. Vitamin D is a nutrient you need for good health. For more in-depth information, see our health professional fact sheet on Vitamin D.įor information on vitamin D and COVID-19, see Dietary Supplements in the Time of COVID-19. Where can I find out more about vitamin D?.
What kinds of vitamin D dietary supplements are available?.
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