The nutrition professional highlighted the wide-ranging benefits this substance has on the functioning of the immune system.

Vitamin D is often called the "sunshine vitamin" because our body makes it when our skin is exposed to sunlight. But with busy lives, indoor jobs, and sunscreen use, many people don't get enough sun.

Add Yahoo as a preferred source to see more of our stories on Google. SMShoot/Getty Images Around 90% of the vitamin D we have in our bodies comes from sun exposure, says Sarah Rueven, RDN. Vitamin D ...

There have been many proven benefits of vitamin D and how it helps maintain a healthy immune system; however, as we spend less time in the sun, our ability to naturally make it declines. Including ...

A major role played by Vitamin D in your health is supporting calcium to develop bones and maintain their health. Calcium is absorbed by the body better with the right amounts of Vitamin C. It ...

Online chatter claims that vitamin D should always be taken with vitamin K2 because it directs where vitamin D goes in the ...

Your baby needs vitamin D to build strong bones and stay healthy. Here’s why it matters in pregnancy – and how to make sure ...

Plus, how to tell if you need to supplement at all.