Vitamin D is good for the immune system, but in older people it doesn't prevent falls or fractures, according to health experts at the U.S. Preventive Services Task Force. Here's why you need it.

For a year, researchers have been studying and arguing over vitamin D's potential for helping protect against or treat COVID-19. The evidence is still not conclusive.

A study published last month shows people with low levels of Vitamin D are at greater risk for COVID-19 infection. Despite that, the U.S. Preventative Services Task Force says there is insufficient evidence to recommend screening asymptomatic patients.