Studies about vitamin D and colon cancer:

Vitamin D and Calcium Supplementation Reduces Cancer Risk: Results of a Randomized Trial (2008)

Conclusion: In a four-year population-based, double-blind, randomized placebo-controlled trial involving 1179 postmenopausal Nebraska women, women receiving a daily dose of 1500mg/day of supplemental calcium and 1100 IU/day of Vitamin D had a 77% lower risk for all types of cancer compared to the placebo group.


Circulating 25-Hydroxyvitamin D Levels and Survival in Patients with Colorectal Cancer (2008)

Conclusion: 304 female participants from the Nurses Health Study who were diagnosed with colorectal cancer between 1991 and 2002 were observed until 2005 or until they died. Those with higher vitamin D levels around the time of diagnoses had higher survival rates.


Optimal Vitamin D Status for Colorectal Cancer Prevention: A Quantitative Meta-Analysis (2007)

Conclusion: People with vitamin D levels above 33 ng/ml have a 50% lower risk of developing colorectal cancer than people with levels below 12 ng/ml.


Estimation of Optimal Serum Concentrations of 25-Hydroxyvitamin D For Multiple Health Outcomes (2006)

Conclusion: People with lower vitamin D levels have a higher risk of developing colorectal cancer


The Role of Vitamin D in Cancer Prevention (2006)

Conclusion: Sun exposure and vitamin D prevent colon, breast, prostate, and ovarian cancer.


Do Sunlight and Vitamin D Reduce the Likelihood of Colon Cancer? (2005)

Conclusion: This epidemiological study found that between 1959 and 1961, the American states that received the most average daily solar radiation (southern latitude states) had the lowest mortality rates for colon cancer and the northern latitude states had significantly higher colon cancer mortality rates.


Vitamin D and Prevention of Colorectal Cancer (2005)

Conclusion: A meta-analysis of 18 scientific studies on the relationship between vitamin D supplementation, serum vitamin D levels, and colon cancer survival found that those who consume at least 1,000 IU of vitamin D daily or have adequate vitamin D levels have a 50% lower risk for developing colon cancer.


1alpha,25-Dihydroxyvitamin D3 Regulates the Expression of Id1 and Id2 Genes and the Angiogenic Phenotype of Human Colon Carcinoma Cells (2005)

Conclusion: “1alpha,25-Dihydroxyvitamin D3 (1alpha,25(OH)2D3) [vitamin D] has antitumor activity in addition to its classical action on calcium metabolism and bone tissue biology.”


Vitamin D Deficiency Enhances the Growth of MC-26 Colon Cancer Xenografts in Balb/c Mice (2005)

Conclusion: Colon cancer cells were injected into vitamin D-deficient mice and vitamin D-sufficient mice. 20 days later, all mice had tumors, but the tumors of the mice with higher vitamin D levels were 40% smaller than the deficient mice. “We conclude that vitamin D deficiency enhances the growth of colon cancer in mice.”


Plasma Vitamin D Metabolites and Risk of Colorectal Cancer in Women (2004)

Conclusion: Older women with lower vitamin D levels have a higher colorectal cancer risk


Phytoestrogens and Vitamin D Metabolism: A New Concept for the Prevention and Therapy of Colorectal, Prostate, and Mammary Carcinomas. (2004)

Conclusion: Optimization of vitamin D levels is important for tumor prevention


Sunlight and Mortality From Breast, Ovarian, Colon, Prostate, and Non-Melanoma Skin Cancer: A Composite Death Certificate Based Case-Control Study (2002)

Conclusion: Sun exposure lowers your risk of developing breast, ovarian, prostate, and colon cancer


An Estimate of Premature Cancer Mortality in the U.S. Due to Inadequate Doses of Solar Ultraviolet-B Radiation (2002)

Conclusion: Lack of midday sun exposure increases one’s risk for developing and dying from breast, colon, ovarian, prostate, bladder, esophageal, kidney, lung, pancreatic, rectal, stomach, and uterine cancer.


Colon Cancer Parallels Rickets (1991)

Conclusion: Regions of America that have higher rates of rickets/osteomalacia have also been found to have higher rates of colon cancer. Rickets is a well-documented severe symptom of vitamin D-deficiency.


Serum 25-hydroxyvitamin D and Colon Cancer: Eight-Year Prospective Study (1989)

Conclusion: Optimizing your vitamin D levels drastically reduces your risk of developing colon cancer


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