Day to day, sunshine might not affect our mood – but light and dark seasons do.

The brains of people with cognitive decline fare better with higher levels of vitamin D, new research finds.

Diabetes diagnoses in dogs are more common in colder areas of the United States and during the winter, researchers report.

Major study by Harvard professor upends idea large doses are needed by otherwise healthy older adults.

Consuming higher amounts of vitamin D – mainly from dietary sources – may help protect against developing young-onset colorectal cancer or precancerous colon polyps, according to the first study to show such an association.

New research finds no evidence that vitamin D helps protect people against COVID-19, despite some reports from earlier in the pandemic.

New research finds no evidence that vitamin D helps protect people against COVID-19, despite some reports from earlier in the pandemic.

Going out in the cold won't necessarily lead to you getting a cold. But cold weather in general is more hospitable to viruses, so it's wise to take steps to keep your immune system strong.

Higher levels of vitamin D in a child's first year may offer a shield against obesity and high blood pressure during the teen years, a new study shows.

Higher doses of vitamin D, referred to as "hypersufficiency," slows the progression of frailty in mice, a new study shows.