Vitamin D3 is a vitamin that our body makes when sunlight touches our skin. It’s really important for strong bones because it helps our body use the calcium we get from food. But it’s not just about bones, Vitamin D3 is also involved in helping our immune system, which is the body’s defense against germs, work properly. People often take Vitamin D3 as a supplement, especially in places where there’s not a lot of sunshine.
