A daily dose of vitamin D can cut the risk of getting some forms of cancer, say scientists in the US.
Researchers found the vitamin can reduce the chances of people developing illnesses including breast, ovarian and colon cancer.
Vitamin D can be found in sunlight, and in certain foods including oily fish, margerine and some breakfast cereals.
Experts said more research was needed to draw definite conclusions from the University of California study.
Cancer charities cautiously welcomed the research, but warned too much vitamin D could harm the kidneys and liver.
Healthy diet's best
Vitamin D is naturally produced in your skin after it is exposed to sunlight, as well as in certain foods.
But spending too much time in the sun can lead to you getting burnt, which can lead to skin cancer in later life.
Scientists also warned against taking too much of the vitamin as a supplement, as too much vitamin D can be bad for you.
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