Let’s face it: cod liver oil is not one of the most appealing supplements, but with just one in five people in the UK eating the NHS-recommended two portions of fish a week, according to the Marine ...

A 3-ounce serving of tuna offers up to 4.84 mcg (193 IU) of vitamin D, but several foods contain even higher amounts.

Two large clinical trials published by The BMJ today show that boosting vitamin D levels in adults during the SARS-CoV-2 pandemic was not associated with protection against respiratory tract ...