While vitamin C is essential for health, high doses can cause serious side effects. Learn the risks and how to use it safely, based on research.

Here’s what vitamin D3 is and why your body needs it.

Most people can meet their daily vitamin C needs—75 milligrams (mg) for women and 90 mg for men—through their diet and don't need a supplement. Eating foods high in vitamin C provides additional ...

A major study found that elevated iron levels from daily multivitamins are linked to shorter lifespans in men — and the men ...

From supporting the immune system to promoting healthy skin, vitamin C plays a crucial role in many of the body’s everyday functions. This often underestimated water-soluble nutrient is involved in ...

Doctors say vitamins are essential nutrients the body needs to function properly. They support everything from nerve health and immunity to bone strength and metabolism. Ideally, these nutrients ...