The participants of the study were separated into three groups; 446 women took calcium and vitamin D3 supplements, a similar number got calcium alone, and 288 took placebo pills.
Among those taking calcium and vitamin D supplements only 13 women, or 3 percent, reported to developing cancer, while those taking calcium alone, 17 women, or 4 percent, got cancer. In the group taking the dummy pills, cancer developed in 20 women, or 7 percent.
The results of the research have led experts to express split opinions on how much of the vitamin to take.
"The findings... are a breakthrough of great medical and public health importance," declared Cedric Garland, a leading vitamin D researcher at the University of California at San Diego. "No other method to prevent cancer has been identified that has such a powerful impact."
Yet, "It's a very small study," contends Dr. Edward Giovannucci, who researches nutrition and cancer at the Harvard School of Public Health. "I don't think it's the last word."
The public is advised to still consult their physicians before deciding to increase their vitamin dosage.
