The Big Iodine Mistake 50% Of People Are Making
In a Nutshell
Iodine deficiency is far more common than excess and causes identical hypothyroid symptoms, yet 38–39% of Americans fall below the required threshold; the richest dietary sources are seaweed, seafood, dairy, eggs, and iodized salt, while sea salt supplies virtually none. Iodine is essential for thyroid hormone synthesis, estrogen regulation, breast/ovarian health, and fetal brain development, but adequate selenium (100–200 µg) is required to neutralize the hydrogen-peroxide byproduct and prevent autoimmune thyroid damage. Adults need 150–300 µg iodine daily (220 µg in pregnancy, 290 µg while breastfeeding), never exceeding 1,100 µg; kelp supplements can meet this need if selenium is co-ingested, and high-dose iodine without selenium or in Hashimoto’s patients risks permanent thyroid harm.
These notes were generated by AI and may contain inaccuracies.
Too little iodine can cause hypothyroidism just as much as too much iodine can cause hypothyroidism. This creates the same symptoms: fatigue, weight gain, hair loss, loss of the outer part of the eyebrow, cold hands, cold feet, dry skin, and brain fog. Iodine is the most confusing mineral in nutrition and the most dangerous if you don't know what you're doing.
There are way more people who are deficient in iodine than people taking too much. To get enough iodine, you need to consume it from your diet. The foods with the most iodine are seaweed, cod fish, shrimp, oysters, dairy, eggs, and iodized salt. Many people are not consuming any of these foods and don't realize they're deficient. Approximately 38 to 39% of Americans test below the iodine threshold. People on plant-based diets are running at very low levels.
Consuming sea salt, especially Himalayan sea salt, provides close to zero iodine. The amount is so tiny it's not going to add up to anything meaningful.
In the 1920s, people were developing goiters (enlarged thyroid glands) and cretinism (stunted physical and mental growth), which was epidemic. In 1948, iodine tablets were being passed around to students in school. People doing intermittent fasting and prolonged fasting need to make sure they're getting iodine.
Iodine influences IQ, especially in children and babies. If a mother is deficient in iodine, the offspring could have a lower IQ by 8 to 13 points. This affects young children and teenagers as well. The brain is highly affected by the thyroid. 80% of all the iodine in your body concentrates in the thyroid gland.
The thyroid controls the rate of metabolism and the speed at which cells work, especially the mitochondria. The thyroid connects to every single cell in your body and the brain. T4 is the inactive thyroid hormone that must be converted to T3 to become activated. Selenium is required for this conversion process. Iodine is embedded in the thyroid hormone itself, not just a cofactor helper mineral.
Iodine helps break down estradiol, the most powerful form of estrogen. Iodine regulates the estrogen receptor. Without enough iodine, the receptor becomes too sensitive, creating issues with estrogen regulation.
The second most abundant place for iodine is in breast tissue. When deficient in iodine in the breast tissue, women often develop fibrocystic breast disease, which can be reversed quickly when starting iodine supplementation. Iodine is also needed in the ovaries, and deficiency can lead to ovarian cysts. The uterus needs iodine to keep estrogen regulated, and iodine is necessary for fallopian tube function.
Iodine is needed to make thyroid hormone through the enzyme TPO (thyroid peroxidase), which builds up thyroid proteins. As a byproduct, hydrogen peroxide is created, which can create a rusting or corrosive effect on the body. Selenium acts as the cleanup crew to eliminate excess hydrogen peroxide through a selenium enzyme.
If you don't have enough selenium but have sufficient iodine, hydrogen peroxide builds up without being eliminated. Excess iodine can trigger an autoimmune disease. With a healthy thyroid, excess iodine temporarily pauses thyroid function, which then bounces back. However, if you have Hashimoto's, the thyroid won't bounce back, creating permanent hypothyroid damage. Selenium can lower antibodies to TPO but doesn't necessarily protect against excess iodine triggering autoimmune disease.
In Japan, people take massive amounts of iodine, but their genetics have evolved over a thousand years from consuming sea kelp. Others may not be able to tolerate these amounts.
Pregnant women need more iodine because it's an easy way to prevent major intellectual disabilities in babies. Symptoms of excess iodine include metallic taste in the mouth, burning sensation, and acne on the chest, face, or back.
Most adults need between 150 to 300 micrograms of iodine daily. The RDA is 150 micrograms, which is the minimum floor, not the goal. Taking 200 to 300 micrograms daily should be sufficient to overcome toxicity. For pregnancy, the requirement is 220 micrograms. When breastfeeding, the requirement increases to 290 micrograms. The top ceiling that should never be exceeded is 1,100 micrograms. Work with a trained practitioner or doctor to regulate iodine levels.
Sea kelp is recommended as an iodine source because it also contains selenium, zinc, and magnesium. Only about 33% of iodine from sea kelp supplements is absorbed, so this needs to be considered when calculating dosage. Organic sea kelp from clean ocean areas is recommended. Selenium dosage of 100 to 200 micrograms is sufficient for thyroid hormone conversion and hydrogen peroxide cleanup.
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