Very high doses of iodine supplements might reduce the pain and other symptoms of fibrocystic breast disease, but more study is necessary to confirm this. Check with your healthcare provider before taking iodine for this condition, especially because iodine can be unsafe at high doses.
Nuclear accidents can release radioactive iodine into the environment, increasing the risk of thyroid cancer in people who are exposed to the radioactive iodine, especially children. People with iodine deficiency who are exposed to radioactive iodine are especially at risk of developing thyroid cancer.
The U. Food and Drug Administration has approved potassium iodide as a thyroid-blocking agent to reduce the risk of thyroid cancer in radiation emergencies.
Yes, if you get too much. Getting high levels of iodine can cause some of the same symptoms as iodine deficiency, including goiter an enlarged thyroid gland. High iodine intakes can also cause thyroid gland inflammation and thyroid cancer. Getting a very large dose of iodine several grams, for example can cause burning of the mouth, throat, and stomach; fever; stomach pain; nausea; vomiting; diarrhea ; weak pulse; and coma.
The daily upper limits for iodine include intakes from all sources—food, beverages, and supplements—and are listed below. These levels do not apply to people who are taking iodine for medical reasons under the care of a doctor.
Iodine supplements can interact or interfere with medicines that you take. Here are several examples:. Tell your doctor, pharmacist, and other healthcare providers about any dietary supplements and prescription or over-the-counter medicines you take.
They can tell you if these dietary supplements might interact with your medicines. They can also explain whether the medicines you take might interfere with how your body absorbs or uses iodine or other nutrients.
Foods contain vitamins, minerals, dietary fiber , and other components that benefit health. In some cases, fortified foods and dietary supplements are useful when it is not possible to meet needs for one or more nutrients e. For more information about building a healthy dietary pattern, see the Dietary Guidelines for Americans and the U.
This fact sheet by the Office of Dietary Supplements ODS provides information that should not take the place of medical advice. We encourage you to talk to your healthcare providers doctor, registered dietitian, pharmacist, etc. Any mention in this publication of a specific product or service, or recommendation from an organization or professional society, does not represent an endorsement by ODS of that product, service, or expert advice.
Updated: March 22, History of changes to this fact sheet. Find ODS on:. Strengthening Knowledge and Understanding of Dietary Supplements. Health Information Health Information. If you have a pre-existing thyroid condition, do not take iodine supplements without checking with your doctor. Iodine deficiency can cause serious problems for developing foetuses, babies and young children. If you are pregnant or breastfeeding and you are iodine deficient, your baby is particularly at risk.
Having too much iodine, for example via supplements, can cause some of the same problems as iodine deficiency such as goitre. The level of iodine considered to be too much, and the symptoms experienced, can vary from person-to-person, depending on underlying health conditions.
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The State of Victoria and the Department of Health shall not bear any liability for reliance by any user on the materials contained on this website. Skip to main content. Healthy eating. Home Healthy eating. Actions for this page Listen Print. Summary Read the full fact sheet. On this page. A measure of how difficult it is to deform a material. It is given by the ratio of the shear stress to the shear strain. A measure of how difficult it is to compress a substance.
It is given by the ratio of the pressure on a body to the fractional decrease in volume. A measure of the propensity of a substance to evaporate. It is defined as the equilibrium pressure exerted by the gas produced above a substance in a closed system. This Site has been carefully prepared for your visit, and we ask you to honour and agree to the following terms and conditions when using this Site.
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Jump to main content. Periodic Table. Glossary Allotropes Some elements exist in several different structural forms, called allotropes. Discovery date Discovered by Bernard Courtois Origin of the name The name is derived from the Greek 'iodes' meaning violet. Allotropes I 2. Glossary Group A vertical column in the periodic table. Fact box. Group 17 Melting point Glossary Image explanation Murray Robertson is the artist behind the images which make up Visual Elements.
Appearance The description of the element in its natural form. Biological role The role of the element in humans, animals and plants. Natural abundance Where the element is most commonly found in nature, and how it is sourced commercially. Uses and properties. Image explanation. The image is of seaweed. Many species of seaweed contain iodine. A black, shiny, crystalline solid. When heated, iodine sublimes to form a purple vapour.
Photography was the first commercial use for iodine after Louis Daguerre, in , invented a technique for producing images on a piece of metal. These images were called daguerreotypes. Today, iodine has many commercial uses. Iodide salts are used in pharmaceuticals and disinfectants, printing inks and dyes, catalysts, animal feed supplements and photographic chemicals.
Iodine is also used to make polarising filters for LCD displays. Iodide is added in small amounts to table salt, in order to avoid iodine deficiency affecting the thyroid gland. The radioactive isotope iodine is sometimes used to treat cancerous thyroid glands. Biological role. Iodine is an essential element for humans, who need a daily intake of about 0. Our bodies contain up to 20 milligrams, mainly in the thyroid gland.
This gland helps to regulate growth and body temperature. Normally we get enough iodine from the food we eat. A deficiency of iodine can cause the thyroid gland to swell up known as goitre. Natural abundance. Iodine is found in seawater, as iodide. It is only present in trace amounts 0. In the past iodine was obtained from seaweed. Now the main sources of iodine are iodate minerals, natural brine deposits left by the evaporation of ancient seas and brackish briny waters from oil and salt wells.
Iodine is obtained commercially by releasing iodine from the iodate obtained from nitrate ores or extracting iodine vapour from the processed brine. Help text not available for this section currently. Elements and Periodic Table History. In the early s, Bernard Courtois of Paris manufactured saltpetre potassium nitrate, KNO 3 and used seaweed ash as his source of potassium.
One day in , he added sulfuric acid and saw purple fumes which condensed to form crystals with a metallic lustre. Courtois guessed this was a new element. In November , they exhibited iodine at the Imperial Institute in Paris. Davy sent a report to the Royal Institution in London where it was mistakenly assumed he was the discoverer, a belief that persisted for more than 50 years. Atomic data. Bond enthalpies. Glossary Common oxidation states The oxidation state of an atom is a measure of the degree of oxidation of an atom.
Oxidation states and isotopes. Glossary Data for this section been provided by the British Geological Survey. Relative supply risk An integrated supply risk index from 1 very low risk to 10 very high risk. Recycling rate The percentage of a commodity which is recycled. Substitutability The availability of suitable substitutes for a given commodity.
Reserve distribution The percentage of the world reserves located in the country with the largest reserves. Political stability of top producer A percentile rank for the political stability of the top producing country, derived from World Bank governance indicators. Political stability of top reserve holder A percentile rank for the political stability of the country with the largest reserves, derived from World Bank governance indicators.
Supply risk. Relative supply risk 6. Young's modulus A measure of the stiffness of a substance. Shear modulus A measure of how difficult it is to deform a material. Bulk modulus A measure of how difficult it is to compress a substance.
Vapour pressure A measure of the propensity of a substance to evaporate. Pressure and temperature data — advanced. Listen to Iodine Podcast Transcript :.
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