Vitamin D is an important vitamin that helps keep our bones strong. Our bodies can make vitamin D when sunlight touches our skin. We can also get it from some foods, like fish and eggs, or take it as a supplement.
Before our bodies can use vitamin D, it has to go through two steps. First, the liver changes it into a different form called calcidiol. Then, the kidneys change it again into its active form, calcitriol, which helps our bones absorb calcium.
Vitamin D helps our bodies use calcium and phosphate to build strong bones. Without it, bones can become weak and soft. It prevents diseases like rickets in children and osteoporosis in older adults.
Vitamin D does more than just help our bones. It also supports our muscles, immune system, and how our body uses sugar for energy. There are two types of vitamin D in food and supplements: D2 and D3. Both are absorbed in the small intestine, and eating some fat with them helps our bodies use them better.
Doctors check vitamin D levels in the blood to see if someone has enough. The body controls how much active vitamin D is in the blood; too little can lead to health problems.
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