An Unsung Hero: Iodine’s Role in Preventing Cancer

Common myths surrounding iodine’s availability and safety have led to an iodine deficiency in many individuals. Iodine plays an essential role in human physiology, and its impact is often overshadowed by its association with thyroid function. But did you know that iodine plays an important role in protecting against certain forms of cancer?

According to a foremost expert on iodine, Dr. David Brownstein, an iodine deficiency, which 97% of us suffer from, leaves us vulnerable and sets the stage for certain kind of cancers to occur.

  1. Beyond the Thyroid: Iodine Distribution – Iodine isn’t limited to the thyroid; it’s found throughout our bodies. Various tissues, such as the stomach, salivary glands, skin, and reproductive organs, concentrate iodine, each with its unique function. It’s not just about thyroid health; iodine plays diverse roles in different bodily systems.
  2. Iodine’s Multifaceted Roles – Iodine isn’t just one-trick pony; its versatility is one of its biggest assets when it comes to fighting cancer. It serves as an antioxidant, protecting our cells from damage. Plus, its anti-inflammatory agent reduces inflammation throughout our bodies. Plus, when it comes to stopping cells from growing too fast (which could lead to cancer), antiproliferative force plays a critical role while its antibacterial properties help combat harmful bacteria.
  3. Breast Cancer and Iodine as Potential Protectors – Studies have indicated that molecular iodine (I2) could potentially protect against breast cancer. I2 has been associated with reduced fibrocystic symptoms and can alter gene expression related to cell cycle growth and proliferation.
  4. Gastric Cancer and Iodine’s Shield – Iodine deficiency has been linked with an increased risk of gastric cancer, due to its antioxidant and anti-inflammatory properties that play an essential role in maintaining stomach health. Interestingly, Poland may have seen reduced stomach cancer rates after adopting salt with added iodine content.
  5. Prostate Cancer in Japan – Nations like Japan with high intakes of iodine have significantly lower prostate cancer rates. Supplementing with iodine has proven itself effective at improving prostate health, particularly among those suffering from benign prostatic hyperplasia (BPH).
  6. Iodine’s Battle Against Various Cancers – Iodine’s reach extends beyond breast, stomach, and prostate cancers. Research has shown its potential to inhibit the growth of cancer cells in various types, including neuroblastoma, melanoma, pancreatic cancer, and colon carcinoma.
  7. The Mighty Role of Iodine – At its core, iodine acts as an essential intracellular agent. It operates as an antioxidant, prodifferentiating agent, anti-inflammatory force, and proapoptotic factor, all vital for maintaining cellular health.

Supplementing with Iodine: A Few Cautions

When considering iodine supplementation, it’s crucial to understand that the form matters. High iodide intake can affect thyroid function, leading to complications. Whole foods like seaweed and fish are natural sources of iodine, but their iodine content can vary significantly. Always check with your personal healthcare provider.

Autoimmune Considerations – Patients suffering from autoimmune thyroid conditions should use caution when supplementing with iodine supplements as this could exacerbate symptoms.

Conclusion: Iodine – A Hidden Cancer Warrior

Iodine deficiency may be an underappreciated risk factor for cancer development and progression. Its strongest evidence lies in preventing stomach cancer, but its potential reaches far and wide. While adding whole sea vegetables to your diet is generally safe, high-dose iodine supplementation should be done under medical guidance.

The next time you sprinkle a little iodized salt on your meal, remember that this humble element might be your unsung hero in the battle against cancer. Do look for quality sea salt. In my book, I Used to Have Cancer, I noted that among the powerful spices that I put to work for me on a daily basis, one of them is Celtic sea salt. It is rich in eighty-four minerals and trace elements.

Want to Learn More About the Amazing Properties of Iodine?

Check out my video interview with Dr. David Brownstein, world-renowned expert in thyroid and iodine and author of the books, Iodine: Why You Need It, Why You Can’t Live Without It and Salt Your Way to Health.



Venturi S, Venturi A, Cimini D, Arduini C, Venturi M, Guidi A. A new hypothesis: iodine and gastric cancer. Eur J Cancer Prev. 1993 Jan;2(1):17-23. PMID: 8428171.

Altman MB, Flynn MJ, Nishikawa RM, Chetty IJ, Barton KN, Movsas B, Kim JH, Brown SL. The potential of iodine for improving breast cancer diagnosis and treatment. Med Hypotheses. 2013 Jan;80(1):94-8. doi: 10.1016/j.mehy.2012.10.018. Epub 2012 Nov 19. PMID: 23171625.

Bespalov VG, Alexandrov VA, Tochilnikov GV, Lukin DЕ, Zhilinskaya NT, Semenov AL, Vasilyeva IN, Romanov VA, Tumanyan IA, Ermakova ED, Kovalevskaya EI, Barakova NV, Baranenko DA. Iodine Bonded with Milk Protein Inhibits Benign Prostatic Hyperplasia Development in Rats. Anticancer Agents Med Chem. 2019;19(13):1627-1632. doi: 10.2174/1871520619666190705143927. PMID: 31284874.

Winder M, Kosztyła Z, Boral A, Kocełak P, Chudek J. The Impact of Iodine Concentration Disorders on Health and Cancer. Nutrients. 2022 May 26;14(11):2209. doi: 10.3390/nu14112209. PMID: 35684009; PMCID: PMC9182735.

Smyth PP. The thyroid, iodine and breast cancer. Breast Cancer Res. 2003;5(5):235-8. doi: 10.1186/bcr638. Epub 2003 Jul 29. PMID: 12927031; PMCID: PMC314438.

Deng S, Wang M, Wang C, Zeng Y, Qin X, Tan Y, Liang B, Cao Y. p53 downregulates PD-L1 expression via miR-34a to inhibit the growth of triple-negative breast cancer cells: a potential clinical immunotherapeutic target. Mol Biol Rep. 2023 Jan;50(1):577-587. doi: 10.1007/s11033-022-08047-z. Epub 2022 Nov 9. PMID: 36352176.

Daniell K, Nucera C. Effect of the micronutrient iodine in thyroid carcinoma angiogenesis. Aging (Albany NY). 2016 Dec 20;8(12):3180-3184. doi: 10.18632/aging.101143. PMID: 27997357; PMCID: PMC5270662.

Tripathi R, Singh P, Singh A, Chagtoo M, Khan S, Tiwari S, Agarwal G, Meeran SM, Godbole MM. Zoledronate and Molecular Iodine Cause Synergistic Cell Death in Triple Negative Breast Cancer through Endoplasmic Reticulum Stress. Nutr Cancer. 2016 May-Jun;68(4):679-88. doi: 10.1080/01635581.2016.1158293. Epub 2016 Apr 26. PMID: 27116040.

Cuenca-Micó O, Delgado-González E, Anguiano B, Vaca-Paniagua F, Medina-Rivera A, Rodríguez-Dorantes M, Aceves C. Effects of Molecular Iodine/Chemotherapy in the Immune Component of Breast Cancer Tumoral Microenvironment. Biomolecules. 2021 Oct 12;11(10):1501. doi: 10.3390/biom11101501. PMID: 34680134; PMCID: PMC8533888.


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