Vitamin K is essential for bone health, controlling blood clots, and other bodily functions. The best way to get the nutrient ...

How long it takes for vitamins and supplements to work depends on factors like the type of vitamin, your diet and hydration, ...

Dear M.E.B.: I think many media sources avoid the complexity of the issue. The preferred unit to describe doses of vitamin A are now micrograms RAE, or “retinol activity units.” Different vitamin A ...

Women who might become pregnant should be especially cautious with vitamin A supplements or avoid them entirely .

For example, 3,000 IU of vitamin A (as retinol) is 900 mcg RAE. About 18,000 IU beta carotene, which is less potent than ...