Women at risk of developing melanoma can benefit from calcium and vitamin D supplements, according to US researchers.
They found a calcium-vitamin D combination more than halved the risk of developing malignant melanoma, the most dangerous strain of the disease, among women with a history of non-lethal forms of skin cancer.
Study leader Dr Jean Tang, from Stanford University in California, emphasised the supplements benefited only women with a history of non-melanoma skin cancer.
Those who took a calcium-vitamin D combination were 57% less likely to develop melanoma as those given a placebo revealed the analysis of data from the Women's Health Initiative published in the Journal of Clinical Oncology.
Dr Tang said: "If you previously had a non-melanoma skin cancer, calcium plus vitamin D might reduce your risk of the more deadly melanoma."