It may be hard to find and expensive to find it, but you want to take vitamin D-3.

A preponderance of evidence, from the best observational studies the medical world has to offer, gathered over 25 years, has led to the conclusion that public health action is needed.

Primary prevention of these cancers has largely been neglected, but we now have proof that the incidence of colon, breast, and ovarian cancer can be reduced dramatically by increasing the public's intake of vitamin D.

The higher the level of vitamin D, the lower the risk of breast cancer.

There's nothing else you can take that has this ability to prevent cancer.

Considering the benefits that I've seen, I don't think that it would hurt to increase calcium intake through low-fat dairy.