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There have been many studies on vitamin D and breast cancer that demonstrate a lower risk of breast cancer when women raise their serum 25(OH)D levels. Below are some of the key findings from the last 10 years:

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77% reduction in all non-skin cancer incidence: A 2007 randomized clinical trial at Creighton University led by Joan Lappe, PhD, RN, FAAN, found that a dose of 1100 IU/day of vitamin D along with 1400-1500 mg/day of calcium helped women aged 55 and older raise their average serum vitamin D level to 38 ng/ml (from a baseline of 29 ng/ml) and prevent approximately 4 out of 5, or 80%, of all invasive cancers including breast cancer. 
 
70% reduction in breast cancer risk: A 2013 case control study at UCSD School of Medicine, Mohr et al.  found that the three months prior to tumor diagnosis was a relevant window of time for cancer prevention and that those with vitamin D levels ≥35 ng/ml had a 70% reduction in risk of developing breast cancer than those with levels <15 ng/ml. 

83% reduction in breast cancer risk: Lowe et al. demonstrated in a 2005 case control study that women with serum levels of >60 ng/ml had more than a five-fold (80%) reduction in breast cancer risk compared to women with levels <20 ng/ml. 

69% reduction in breast cancer risk: In a 2008 case control study, Abbas et al. found that those with 25(OH)D levels ≥30 ng/ml had an almost 70% reduced risk of post-menopausal breast cancer compared to those with levels <12 ng/ml.  

55% reduction in breast cancer risk: In a 2009 case control study, Abbas et al. found that women with 25(OH)D levels ≥24 ng/ml had more than a 50% reduction in risk of pre-menopausal breast cancer compared to those with levels <12 ng/ml.   

57% reduction in breast cancer risk: Bilinski et. al. demonstrated in a 2013 case control study that women with 25(OH)D levels ≥30 ng/ml had an almost 60% reduction in risk of breast cancer compared to those with levels <10 ng/ml.  Among women younger than 50 years old, there was a 71% reduction in risk and among women 50 years and older there was a 55% reduction in risk.  

62% reduction in breast cancer risk: In a 2009 case control study, Rejnmark found that pre-menopausal women with 25(OH)D levels ≥34 ng/ml had more than a 60% reduction in breast cancer risk compared to women with levels <24 ng/ml.  

54% reduction in breast cancer risk: In a 2009 case control study, Crew et. al. found that post-menopausal women with 25(OH)D levels ≥40 ng/ml had more than a 50% reduction in breast cancer risk compared to women with levels <20 ng/ml.  

63% reduction in breast cancer risk: In a 2012 case control study, Yao et. al. found that women with 25(OH)D levels ≥30 ng/ml had more than a 60% reduction in breast cancer risk compared to women with levels <20 ng/ml.  Among post-menopausal women, there was a 71% reduction.   

59% reduction in breast cancer risk: In a 2012 case control study, Peppone et. al. found that those with 25(OH)D levels ≥32 ng/ml had an almost 60% reduction in breast cancer risk compared to women with levels ≤20 ng/ml.