In a study of postmenopausal women with a history of nonmelanoma skin cancer, those who took calcium and vitamin D supplements had 57% fewer melanomas than women who did not take the supplements. The study was part of the large Women's Health Initiative, and the initial purpose was to look at the effects of calcium and vitamin D on osteoporosis risk. Researchers did not find a protective effect in all women. "This is probably the strongest piece of evidence for a role of calcium and vitamin D in skin cancer prevention," said dermatology researcher Jean Y. Tang.

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