Integrative Health Blog

Breast Cancer and Vitamin D: What the Research Says

Posted by Paymon Sadrolsadot ND, PhD on Fri, Aug 25, 2023


Breast cancer is a prevalent and life-altering disease that affects millions of women worldwide. Over the years, researchers have explored various factors that may influence breast cancer risk and outcomes. One such area of interest is the relationship between breast cancer and vitamin D deficiency. In this blog, we will delve into the existing research and shed light on the potential link between vitamin D and breast cancer[1]

Vitamin D and Breast Cancer Risk 

Numerous studies have investigated whether vitamin D deficiency is associated with an increased risk of breast cancer. Vitamin D plays a critical role in various bodily processes, including cell growth regulation and immune function. Some research suggests that adequate vitamin D levels may have a protective effect against certain cancers, including breast cancer. While the evidence is not yet definitive, the association between vitamin D and breast cancer risk warrants further exploration[1]

Vitamin D and Breast Cancer Outcomes 

In addition to its potential role in breast cancer risk, vitamin D status has also been examined in relation to breast cancer outcomes. Some studies have found that breast cancer patients with low vitamin D levels may face an increased risk of disease progression and a poorer overall survival rate compared to those with sufficient vitamin D levels. This suggests that optimizing vitamin D levels might play a role in improving breast cancer prognosis[2][3]

Mechanisms of Action 

Vitamin D is believed to influence cell growth and differentiation, reduce inflammation, and support the immune system. These processes are crucial in cancer development and progression. However, further studies are needed to fully comprehend how vitamin D may impact breast cancer biology[2][4]

Maintaining adequate vitamin D levels through appropriate supplementation, dietary choices, and exposure to sunlight remains important for overall health. I routinely test Vitamin D levels in all my patients to make sure they are getting enough Vitamin D. If you have concerns about your vitamin D status or breast cancer risk, consult your naturopathic doctor for personalized guidance and screening. 

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Dr. Paymon Sadrolsadot, ND, PhD is a highly skilled naturopath with over 20 years of integrative medicine experience.  He has professional experience as a physician, acupuncturist, educator and clinician. He combines Eastern and Western medical philosophies with integrative medicine in his approach to naturopathic oncology.


Read more natural oncology blogs by Dr. Sadrolsadot here: 

Candida Infections and Cancer: Discovering the Potential Connection

Melatonin in Cancer Treatment: Shedding Light on its Potential

The Best Diet for Cancer Patients: Nourishing Your Body for Health

Naturopathic Oncology: Unveiling the Many Causes of Cancer


[1]. Hossain S, Beydoun MA, Beydoun HA, et al. Vitamin D and breast cancer: a systematic review and meta-analysis of observational studies. Clin Nutr ESPEN. 2019;29:173-187. 

[2]. Deeb KK, Trump DL, Johnson CS. Vitamin D signalling pathways in cancer: potential for anticancer therapeutics. Nat Rev Cancer. 2007;7(9):684-700. 

[3]. Mohr SB, Gorham ED, Kim J, et al. Meta-analysis of vitamin D sufficiency for improving survival of patients with breast cancer. Anticancer Res. 2014;34(3):1163-1166. 

[4]. Yao S, Kwan ML, Ergas IJ, et al. Association of serum level of vitamin D at diagnosis with breast cancer survival: a case-cohort analysis in the Pathways study. JAMA Oncol. 2017;3(3):351-357. 


Topics: cancer, integrative cancer treatment