(NaturalNews) Taking vitamin and calcium supplements may reduce women's risk of breast cancer by as much as 40 percent, according to a study conducted by researchers from the Ponce School of Medicine in Puerto Rico, and presented at the annual meeting of the American Association for Cancer Research.

"It is not an immediate effect. You don't take a vitamin today and your breast cancer risk is reduced tomorrow," researcher Jaime Matta said. "However, we did see a long-term effect in terms of breast cancer reduction."

The researchers conducted the study on 457 healthy women and 268 with breast cancer, all of whom had been taking vitamin and mineral supplements for the past five years. The women filled out a questionnaire about which vitamins and minerals they were taking, how regularly they took them, and if they were still taking them.

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