Why is Vitamin D so important to us and how does it help our body? Did you know that your skin needs to get enough direct UV light from sunshine for your body to make around 90% of the Vitamin D it needs? The rest of your Vitamin D intake comes from foods rich in the vitamin. If you don’t have enough Vitamin D, your body is unable to absorb calcium and promote bone growth. Vitamin D also required for the functioning of muscles, immune system and modulates anti-inflammatory response.