Vitamin D’s best-known role is to keep bones healthy by increasing the intestinal absorption of calcium. Without enough vitamin D, the body can only absorb 10% to 15% of dietary calcium. However, the less known fact is that Vitamin D has an important role in regulating cell growth. Laboratory experiments suggest that it helps prevent the unrestrained cell multiplication that characterises cancer by reducing cell division and restricting tumor blood supply (angiogenesis), increasing the death of cancer cells (apoptosis), and limiting the spread of cancer cells (metastasis).
Researchers now agree that the epidemic of a wide variety of cancers may be due to widespread vitamin D deficiency caused in large part by lack of exposure to sun. The cancers most strongly linked to low levels of vitamin D are Breast, Colon, Lung and Prostate cancer.
In 2005, Wei Zhou, a researcher working with Dr. Edward Giovannucci, Professor of Nutrition and Epidemiology at Harvard School of Public Health, reported that evidence suggests vitamin D aids in the survival of lung cancer patients. Other similar studies in Norway and England back this assertion. In the same year, another Harvard School of Public Health research fellow, Dr. Ying Zhou, along with Professor David Christiani, found that early stage lung cancer patients with the highest vitamin D input, lived almost three times longer than patients with the lowest input.
Read more about Vitamin D3’s Anti-Cancer properties.