Vitamin D3 is important for good overall health and strong and healthy bones. It’s also an important factor in making sure your muscles, heart, lungs and brain work well and that your body can fight infection.
Your body can make its own vitamin D3 from sunlight. You can also get vitamin D3 from supplements and a very small amount comes from a few foods you eat.
The vitamin D3 that you get in your skin from sunlight, and the vitamin D3 from supplements, has to be changed by your body a number of times before it can be used. Once it’s ready, your body uses it to manage the amount of calcium in your blood, bones and gut and to help cells all over your body to communicate properly.