What is vitamin D3 exactly and how does it differ from vitamin D? Who should be taking a supplement? We spoke to experts to get the DL on vitamin D3. Here's what to know about vitamin D3 benefits ...

If you are 70 years and older, your daily dose should be closer to 800 IU, notes Gans. Most people can take a vitamin D supplement for its immunity and other health benefits, says Arsenault.

Participants were randomized to receive one of four doses of vitamin D3 supplementation: 200, 1000, 2000, or 4000 IU/d, with 200 IU/d as the reference dose. Cardiac biomarkers, including hs-cTnI ...