Vitamin D is one of the most popular supplements in the world, but nutrition experts say its effectiveness may depend on another key nutrient many people overlook: vitamin K2.

Vitamin D and vitamin K are frequently paired in supplements due to potential synergistic effects, though taking them together may not always be necessary.

Vitamin D supplementation does not prevent COVID-19 or improve symptoms but it may help lower the risk of long COVID, a recent study suggests.

Vitamin D supplements may offer researchers a new clue about lingering COVID symptoms that persist after infection, according ...

I am confused about vitamin D. I have been taking it for years, along with calcium, to protect my bones. Recently, I read that there is no evidence it works and that too much could be harmful. Can you ...

A major clinical trial has delivered an unexpected twist in the search for ways to fight COVID-19 and its lingering effects. Researchers at Mass General Brigham found that taking high doses of vitamin ...

Q. I take pramipexole to treat restless leg syndrome. When I play casinos, I seem not to be able to stop playing. I have almost maxed out my credit cards.My doctor said a drug I was taking could cause ...

Overdoing it on this popular supplement can lead to a host of serious health issues, which one man learned the hard way. Per a study published in the journal BMJ Case Reports, the unidentified ...

Vitamin D is an essential nutrient for your immune system, heart health, and more. However, most Americans don't get enough ...

Researchers are still trying to understand why some people develop Long COVID: lasting symptoms of the disease that can ...