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Breast Cancer Prevention: Canadian Cancer Society Recommends Vitamin D3 to Reduce Breast Cancer Risk

By Keith D. Bishop, Clinical Nutritionist, B.Sc. Pharmacy - June 2007

The Canadian Cancer Society recommends taking vitamin D3 during the fall and winter to reduce the risk for colorectal cancer, breast cancer and prostate cancer.

Research studies demonstrate people with lower vitamin D3 levels have a greater risk of developing cancer. Supplemental vitamin D3 seems to reduce cancer risk.

Breast Cancer Natural Prevention: Canadian Cancer Society Recommends Daily Vitamin D3 Supplementation.In consultation with a health care provider the cancer society recommends that:

Adults living in Canada should consider taking 1,000 international units (IU) of vitamin D3 supplements a day in the fall and winter, when sun exposure in the country is not high enough to produce adequate vitamin D naturally. 

Adults at higher risk of having vitamin D3 deficiency should consider taking the 1,000 IU supplement year round. 

Factors that increase the risk for vitamin D3 deficiency include:

  • Getting older, since the skin is less capable of producing vitamin D3 from exposure to the sun with age. No precise age cutoff has been determined. 
  • Darker skin, since the darker pigment acts as a natural sunscreen that makes it harder to produce the vitamin. 
  • Not going outside often. 
  • Wearing clothing that covers most skin.
Click or tap here to learn how to test
for vitamin D.
The Canadian Cancer Society recommends 1,000 IU daily of vitamin D3. Even this low level of supplementation will lower the risk cancer.

In June of 2007 the American Journal of Clinical Nutrition published a vitamin D3 and calcium study of 1,200 women in Eastern Nebraska. There were about 37 cases of breast cancer in 1,000 women. When vitamin D3 and calcium were given, the risk of cancer was reduced by about half, to 18 cancers per 1,000 women, compared to placebo.

Researchers state: “Improving calcium and vitamin D nutritional status substantially reduces all-cancer risk in postmenopausal women.”

Reference Sources:
[1] CBC News June 7, 2007
[2] Vitamin D and calcium supplementation reduces cancer risk: results of a randomized trial. Lappe JM, Travers-Gustafson D, Davies KM, Recker RR, Heaney RP. American Journal of Clinical Nutrition 2007 Jun;85(6):1586-91.

Natural Cancer Reports Pearl

A daily dose of 1,000 iu of vitamin D3 may not be enough. Additional studies show more than half of the U.S. population is deficient in vitamin D3. A 25-hydroxyvitamin D3 blood test is the only way to know how much vitamin D3 you should be taking.

A word of caution: The prescription capsule form of vitamin D is not the natural form of vitamin D3. It is vitamin D2 and is about ¼ to ½ as strong as the natural vitamin D3 called cholecalciferol.

Vitamin D3 appears to help cell recognize what kind of cell they should become or when they should stop proliferating.

Sunshine exposure and fatty fish and egg yolks are the only natural sources of vitamin D3.

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About the Author:

Keith D. Bishop, Clinical Nutritionist, B.Sc. Pharmacy helps his clients improve their health by using natural products, tests and self care. He writes special reports on natural product, diet and lifestyle effects on cancer. You may schedule an appointment for customized natural cancer recommendations by calling 405.919.1982. 

Click here to learn more about Alternative Cancer Treatment Appointments.


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