Commonly known as the sunshine vitamin, our bodies produce vitamin D in response to sun exposure.
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One professor told Newsweek he feared the medicines and supplements Trump has taken will become the next hydroxychloroquine.
Three studies into vitamin D suggest a potential link, but scientists say it's important to remember correlation does not equal causation.
The study adds to the debate on whether it is worth taking fish oils.
Vitamin D regulates a number of genes involved in diabetes, the co-author of the study told Newsweek.
Scientists believe a lack of the vitamin could be associated with abdominal fat storage.
The researchers found that taking vitamin D decreased inflammation, redness and swelling, compared with taking a placebo, and this effect increased in proportion to how much was consumed.
This is the first study to show that vitamin D can help reduce skin inflammation.
The actor and rapper says he won't judge the Fox anchor 'the same way that he judged me.'
A lack of the vitamin can cause rickets in children and bone disease in adults.
Patients with depression who were exposed to direct sunlight left the hospital four days quicker.
Where the sun doesn't rise for 60 days a year, residents rely on cod oil and light boxes to survive.