Today, October 21, is World Iodine Deficiency Day, also called Global Iodine Deficiency Disorders Prevention Day. It is a public-health awareness day that the Iodine Global Network has marked every year since the early 1990s, and this morning it is trending on X. Pulse's trend check counted 209 posts about iodine by 8 AM ET, more than the 182 posted on all of October 20. When a mineral most people only know from the salt shaker starts trending, the natural follow-up questions are simple: what does iodine actually do, where do you get it, and how do you tell a well-made iodine supplement from a vague one?
AJTV is an independent fan-affiliate guide. This article is general information only, not medical advice. It does not diagnose anything, does not suggest that any supplement can prevent, treat, or cure any disease, and does not give dosage recommendations. Talk to your own healthcare provider before adding a supplement to your routine.
Key takeaways
- Iodine is an essential trace mineral. Your body cannot make it, so it has to come from food, iodized salt, or a supplement.
- Iodine supports normal thyroid function, because the thyroid uses it to make its hormones.*
- Iodized salt arrived in U.S. stores in 1924 and is one of the best-known food fortification stories in history.
- Many modern salts and processed foods are not iodized, which is part of why the topic keeps coming back.
- When comparing iodine supplements, look at the form, the amount stated per serving, the source, and independent testing. More is not automatically better.
- If you are pregnant, breastfeeding, have a thyroid condition, or take medication, check with your provider before using iodine.
What is World Iodine Deficiency Day?
World Iodine Deficiency Day falls on October 21 every year. It is supported by the Iodine Global Network, which works alongside groups such as the World Health Organization and UNICEF to promote adequate iodine intake around the world. The main tool behind that effort is universal salt iodization, the practice of adding small amounts of iodine to ordinary table salt.
The day exists because iodine is easy to overlook. You cannot see it, taste it, or feel it on your plate, and the amount in food depends heavily on where it was grown or produced.
A short history of iodized salt
In the early 1900s, parts of the northern United States, especially around the Great Lakes, the Appalachians, and the Pacific Northwest, were known as the "goiter belt," because soils there are naturally low in iodine and visible thyroid swelling was common. Doctors in Ohio and Michigan studied the problem, and in 1922 a University of Michigan pediatrician proposed adding iodine to table salt.
On May 1, 1924, iodized salt first appeared on grocery shelves in Michigan. Morton Salt began selling iodized salt the same year, and the FDA later asked that it be labeled with the line "This salt provides iodide, a necessary nutrient." Switzerland began a similar program around the same time, and today most households worldwide use iodized salt.
Why iodine is trending again
Beyond today's awareness day, a few everyday habits keep iodine in the conversation:
- Salt choices. Many people now cook with sea salt, Himalayan pink salt, or kosher salt. These are often not iodized, so it is worth checking the label.
- Processed foods. Most of the salt in packaged and restaurant food in the U.S. is not iodized, even though it adds up to a large share of total salt intake.
- Diet changes. People who eat little dairy, seafood, or eggs, including many plant-based eaters, may get less iodine from food.
None of this means everyone is low in iodine, and only a healthcare provider can tell you about your own levels. It does explain why so many people are reading labels and asking questions this week.
What iodine does in the body
Iodine is a trace mineral, which means you need only a small amount of it, but that amount matters. Your thyroid gland uses iodine to make thyroid hormones, which help regulate metabolism and support normal growth and development. Put simply, iodine supports normal thyroid function.*
Your body does not make iodine and stores only a limited amount, so a steady intake from your diet is what counts. Getting too much iodine can also affect the thyroid, which is why more is not automatically better.
Food sources of iodine
Most people get iodine from a mix of these foods:
- Seaweed, such as kelp, nori, and wakame. Amounts vary widely from one product to the next.
- Fish and seafood, such as cod, tuna, and shrimp.
- Dairy, including milk, yogurt, and cheese.
- Eggs.
- Iodized table salt. Check the label for the word "iodized."
The iodine content of plant foods depends on the soil they were grown in, so the same vegetable can contain very different amounts depending on where it comes from.
How to choose an iodine supplement
If you and your provider decide an iodine supplement makes sense, the label is where good and weak products separate. Here is what to compare.
Form
Iodine supplements usually list one of a few forms: potassium iodide, sodium iodide, potassium iodate, molecular iodine, or iodine from kelp or seaweed. Some products combine more than one form. A good label names the exact form instead of just saying "iodine." Kelp-based products can vary from batch to batch, so look for a brand that states a standardized amount.
Drops vs. capsules or tablets
Liquid drops can make it easier to adjust how you take a product, while capsules and tablets give a fixed amount in each serving. Neither is automatically better. What matters is that the label clearly states the amount of iodine per serving, so you know exactly what you are getting.
Source and transparency
Look for a brand that explains how its iodine is made and where its ingredients come from. Clear, specific information is a better sign than bold marketing language. Also check for other ingredients, such as added minerals, fillers, alcohol in drops, or flavorings.
Third-party testing
The FDA does not approve dietary supplements before they are sold, so independent testing adds an extra layer of confidence. Look for a certificate of analysis (COA) or a third-party lab seal, and see whether the brand tests for purity and contaminants such as heavy metals. That is especially important for seaweed-based products.
Check your total intake
Many multivitamins, prenatal vitamins, and sea moss products already contain iodine. Add up what is in everything you take, and follow the directions on the label and your provider's advice. This guide does not give amounts.
Who should talk to a doctor first
Iodine is not right for everyone in supplement form. Speak with your doctor or pharmacist before using an iodine supplement if you:
- Are pregnant, planning a pregnancy, or breastfeeding.
- Have been diagnosed with any thyroid condition, or have a family history of one.
- Take prescription medication, especially thyroid medication, or manage an ongoing health condition.
- Already take a multivitamin, prenatal, kelp, or sea moss product.
- Are considering iodine for a child.
Where to buy an iodine supplement
If you are comparing iodine supplements, T-3 Trifecta Iodine is the AJTV pick for this category. It is described as a precision-prepared trace mineral designed to support thyroid function, with each batch taking over six months to prepare.* Check its label against the points above before you buy, and browse everything we cover in our full collection.
Building a routine? Our label-reading guides to bovine colostrum and creatine after 50 use the same approach.
Purchases are completed on the official store at TheAlexJonesStore.com/AJTV.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for general information only and is not medical advice. Always consult a qualified healthcare provider before starting any supplement, especially if you are pregnant, nursing, have a thyroid condition, take medication, or have a medical condition. AJTV is an independent fan-affiliate site, not the official Alex Jones store.