Professor Julia Newton-Bishop, a leading expert in the field of Melanoma advises:
“Stick to the advice of the Science Advisory Committee on Nutrition and take 400IU (10 μg) of a vitamin D supplement daily. People who are overweight, and have very little exposure to the sun may need a little more: 800IU (20 μg) per day.
We don’t know what high doses do to cancer cells, so I would always say that we should avoid deficiency, but also, I would not recommend high doses. Family members of melanoma patients often have similar pale, freckly skin and the advice for them would be the same, — avoid sunburn, but also avoid vitamin D deficiency.”