Iodine and Breast Health

Crosby Chiropractic St. Peters

Iodine and Breast Health

The thyroid absorbs iodine from the blood and uses it to make the thyroid hormones T3
and T4, which contain three and four atoms of iodine per molecule respectively. This
mineral is therefore essential to optimal functioning of the thyroid gland and for thyroid
hormone production.
Until the early 1900’s, doctors treated both hypothyroidism and Grave's disease with
inorganic iodine. By the 1930s, even though iodine deficiency was (and still is) the most
common cause of hypothyroidism and goiter, doctors changed the standard protocol
for hypothyroidism by substituting thyroid extract for iodine. Endocrinologists and family
doctors still administer T4 to reduce the symptoms of hypothyroidism.
Unfortunately, what doctors don't fully appreciate is that iodine deficiency in women
predisposes them to breast cancer. 1,2  Furthermore, giving T4 to iodine-deficient women
further increased their breast cancer risk. 3 Modern iodine researchers/clinicians using
Lugol’s iodine/iodide solution have had success with hypothyroidism, especially when
iodine is combined with other important nutrients.
Breast tissue is more efficient in storing iodine compared to the thyroid gland. 4  So it's
not surprising that there is a strong connection between breast health and iodine.5 With
1 in 8 U.S. women (just under 12%) developing invasive breast cancer over the course
of her lifetime, monitoring iodine is a simple way to reduce breast cancer risk.6
Japanese women get much more iodine in their diets than American women and have
65% lower risk of breast cancer than American women. Iodine is so important for
breast health, that it may be that hypothyroidism frees up more iodine for use in breast
tissue actually lowering their levels of breast cancer. The body, it would seem protects
breast tissue at the expense of thyroid function.
Autoimmune thyroid disease occurs more often in patients with breast cancer.
Researchers have found a significant link between breast cancer and Hashimoto's
thyroiditis. One recent study suggested that any woman with breast cancer be
screened for Hashimoto’s thyroiditis. 5,7 Iodine levels in breast tissue were lower in
women diagnosed with breast cancer than in women with normal breasts. 7,8
Iodine's has also been shown to improve fibrocystic changes to breast tissue. 9,10
Before assuming you should take iodine, have your doctor check your iodine levels. A
simple blood test or a 24 hour urine test with provide your iodine levels. If they are low,
supplementation with seaweed or having a physician provide Lugol’s are two effective
ways to raise your iodine levels. Iodine excess however, can give the symptoms of
hypothyroidism also so it is best to retest iodine levels periodically if on an iodine
supplement. Other sources of iodine outside of seaweed and kelp, includes egg and
dairy products.

1. Abraham GE, et al. The Original Internist. 2002;9:30-41.
2. Breast Cancer Res. 2003; 5(5): 235–238.Published online 2003 July 29.The thyroid,
iodine and breast cancer Peter PA Smyth
3. Ghandrakant C, et al. JAMA. 1976;238:1124
4. Eskin BA. Adv Exp Med Biol. 1977;91:293-304
5. Giani C, et al. Relationship between breast cancer and thyroid disease: relevance of
autoimmune thyroid disorders in breast malignancy. J Clin Endocrinol Metab. 1996
6. Mar;81(3):990http://www.breastcancer.org/symptoms/understand_bc/statistics
7. No authors listed. Iodine Monograph. Alt Med Review. 2010;15(3):273-8.
8. Ghent WR, et al. Can J Surg. 1993;36;453-60.
9. Molnár I, et al. Orv Hetil. 1998 Aug 30;139(35):2071-3.
10. Behrouzian R and Aghdami N. East Mediterr Health J. 2004 Nov;10(6):921-4.

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