The 'sunshine vitamin' plays a key part in preventing colon cancer and blood cancers, including leukaemia and lymphoma, and can also slow the progress of breast and prostate cancers.
As Covid-19 researchers have been discovering, the vitamin is vital for regulating a healthy immune system, and especially the immune cells such as monocytes and T-cells.
This is probably why it protects against blood cancers, say researchers from the Autonomous University of Madrid, who have reviewed the published research into the vitamin.
Evidence that vitamin D also treats cancer isn't quite so strong, but people whose breast and prostate cancer is more virulent also tend to be low in the vitamin, suggesting it could play some part in the cancers' progress.
For most people, and especially those in the northern hemisphere, daily exposure to sunshine may not be enough to top up levels, and supplements should be taken as well, the researchers say.
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