In April 2026, a walk down the supplement aisle at any major pharmacy tells a striking story: vitamin D capsules containing 5 ...

(Peter Dazeley/The Image Bank/Getty Images) The "sunshine vitamin" may come with a dark side. Just as a lack of vitamin D can ...

Learn what happens when you take vitamin D supplements long term. Get evidence-based guidance on safety, potential benefits, ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." While you can take certain supplements any time of the day, others need a little more careful planning.

Learn about the best time of day and way to take vitamin D, including how the timing may affect sleep, and if you should consider supplementing with this nutrient.

What is vitamin D3? Your body creates this vitamin naturally when exposed to sunlight. In the winter, however, we tend to stay inside more, making it harder to get the proper amount of D3. There are a ...

More than 40 percent of the U.S. population is estimated to have a vitamin D deficiency, especially in regions with less year-round sun exposure. The vitamin, which is vital for the body’s absorption ...

Preterm infants may need to be given 800 international units of vitamin D a day to ensure they develop strong bones, according to a new study. Preterm infants may need to be given 800 international ...