Many people are deficient in vitamin D. The easiest and most reliable way of getting the appropriate amount is from food and a daily supplement.

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

For example, breast cancer will strike one in eight American women in their lifetime. Early detection using mammography reduces mortality rates by approximately 20 percent. But use of vitamin D might prevent this cancer in the first place.

A glass of milk, for example, has only 100 international units. Other foods, such as orange juice, yogurt and cheese, are now beginning to be fortified, but you have to work fairly hard to reach 1,000 IU a day.

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.

Many people are deficient in vitamin D. A glass of milk, for example, has only 100 IU. Other foods, such as orange juice, yogurt and cheese, are now beginning to be fortified, but you have to work fairly hard to reach 1,000 IU a day.

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.

African-American women who develop breast cancer are more likely to die from the disease than White women of the same age. Survival rates are worse among African-Americans for colon, prostate and ovarian cancers as well.

The strongest effect is for colorectal cancer. There's also a substantial effect for breast and ovarian cancer.

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