Table of Contents<\/b><\/p>\n [\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_single_image image=”7328″ img_size=”full”][vc_column_text single_style=””]Figure 1. Iodine: The Violet Element That Shapes the Human Mind.<\/strong> How a microgram-sized mineral governs growth, metabolism, and the cognitive future of nations. [Adapted and modified from: https:\/\/pubchem.ncbi.nlm.nih.gov\/periodic-table\/<\/a>][\/vc_column_text][\/vc_column][\/vc_row][vc_row el_id=”blog-scroll-point-1″][vc_column][vc_custom_heading text=”Introduction”][vc_custom_heading text=”The Violet Element That Shapes Human Destiny”][vc_column_text single_style=”” el_id=”blog-scroll-point-1″]Among the elements that sustain human life, few carry a story as dramatic\u2014or as quietly consequential\u2014as iodine. Named from the Greek iodes<\/em>, meaning \u201cviolet<\/strong>\u201d, this element first revealed itself through the shimmering purple vapor rising from dark crystals. Yet behind this poetic hue lies a mineral whose influence reaches far deeper than its appearance suggests. Iodine is required in microgram quantities<\/strong>, but its absence has altered the intellectual landscape of entire populations, shaped public-health policy across continents, and determined the cognitive potential of generations. These hormones regulate growth, brain development, metabolic rate<\/strong>, and body temperature<\/strong> across the lifespan. Beyond the thyroid, iodine is also found in the salivary glands, stomach, pituitary, ovaries, epidermis<\/strong>, and components of the immune system<\/strong>.<\/p>\n Although the body can recycle iodine<\/strong>, small amounts are lost daily through urine, making dietary intake essential<\/strong>. Interestingly, iodine is not required by plants<\/strong>, though they readily absorb it from soil or air, which is why plant iodine content varies dramatically by geography [1-6] (see Table 1<\/strong>).[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_id=”blog-scroll-point-5″][vc_column][vc_custom_heading text=”Dangerous Element \u2014 A Narrow Window Between Benefit and Harm” use_theme_fonts=”yes”][vc_column_text single_style=””]Iodine\u2019s reactivity makes it both useful and hazardous. Iodine vapor<\/strong> irritates the eyes and lungs, and workplace exposure must remain below 1 mg\/m\u00b3<\/strong>. Elemental iodine is toxic when ingested<\/strong>, with doses as low as 3 g<\/strong> capable of causing death. In contrast, iodides (I\u207b)<\/strong> are generally safer, though excessive intake can still provoke adverse reactions, particularly in individuals with underlying thyroid disease. [\/vc_column_text][vc_column_text single_style=””]Iodine deficiency is best assessed through urinary iodine concentration<\/strong>, with levels indicating iodine deficiency disorder (IDD)<\/strong>. [\/vc_column_text][vc_column_text single_style=””]Iodine-125<\/b>, a gamma emitter, is used as a radioactive tracer<\/b> and in prostate cancer therapy<\/b>, where it is implanted as tiny titanium pellets. Because iodide naturally accumulates in the thyroid, radioactive isotopes can selectively destroy thyroid cancer cells<\/b> while sparing other tissues.<\/p>\n Iodine-131<\/b>, the first radionuclide used therapeutically after World War II, emits both beta<\/b> and gamma rays<\/b> as it decays to xenon gas. It remains a cornerstone in diagnosing and treating thyroid disorders<\/b>, including hyperthyroidism and thyroid cancer.<\/p>\n Iodine\u2019s diagnostic utility extends beyond the thyroid. As a heavy element<\/b>, iodine effectively blocks X-rays<\/b>, making iodinated compounds ideal contrast agents<\/b> for imaging blood vessels, organs, and tumors.[\/vc_column_text][vc_column_text single_style=””]In gynecology, Lugol\u2019s iodine<\/b> plays a critical role in colposcopy<\/b>, where it stains healthy, glycogen-rich cervical tissue brown<\/b>, leaving abnormal or cancerous tissue unstained<\/b>, allowing early detection of cervical lesions.<\/p>\n Although iodine tincture has largely disappeared from household medicine cabinets, innovation continues. A modern therapy called Iodozyme<\/b> is used for chronic leg ulcers. It employs a two-layer dressing that generates iodine in situ<\/b>, through the oxidation of iodide by hydrogen peroxide\u2014an elegant example of controlled, localized iodine release.[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”blog-text-35795″ el_id=”blog-scroll-point-9″][vc_column][vc_custom_heading text=”Element of Surprises \u2014 Chemistry, Detection, and Biological Mysteries” el_class=”blog-text-35795″][vc_column_text single_style=””]Iodine\u2019s chemistry has long fascinated scientists. Its dramatic blue reaction with starch<\/strong> once made it indispensable in analytical titrations. This reaction still has practical use today: banknote detection pens<\/strong> contain Lugol\u2019s solution, which turns blue<\/strong> when it contacts starch in counterfeit paper. Genuine banknote paper contains no starch<\/strong>, so no color change occurs.[\/vc_column_text][vc_column_text single_style=””]Beyond forming the familiar iodide ion (I\u207b)<\/strong>, iodine can also lose an electron<\/strong> to form the positive ion (I\u207a)<\/strong>. This less common oxidation state may play a role in the biosynthesis of organo-iodine compounds<\/strong>, including the formation of thyroxine (T\u2084)<\/strong> within the thyroid gland\u2014an area where biochemical research continues to evolve. [\/vc_column_text][vc_column_text single_style=””](Cf. previous blogs entitled as: \u201cSelenium: The Moon-Named Element That Protects Human Life.<\/a>\u201d; \u201cZinc: The Essential Element We Cannot Live Without.<\/a>\u201d) The global introduction of iodized salt<\/b> stands as one of the most successful public-health interventions of the 20th century, dramatically reducing goiter, hypothyroidism, and cretinism in many regions. Yet this success is uneven. Deficiency persists where iodization programs are poorly implemented, where soil and water remain iodine-poor, or where dietary patterns shift away from iodine-rich foods. These gaps highlight the ongoing need for consistent monitoring<\/b>, policy enforcement<\/b>, and public-health vigilance<\/b> to ensure that iodine sufficiency is maintained across generations.<\/p>\n Despite centuries of use, important scientific questions remain unanswered. The precise molecular mechanisms governing iodine transport into the thyroid<\/b>, the potential role of I\u207a intermediates<\/b> in hormone synthesis, and the long-term effects of chronic low-grade deficiency<\/b> are still being explored. Emerging dietary trends\u2014particularly plant-based diets\u2014may inadvertently reduce iodine intake unless carefully supplemented, raising new concerns for populations that already hover near the threshold of deficiency. These knowledge gaps point toward future research priorities, including the development of more sensitive biomarkers<\/b> beyond urinary iodine concentration and a deeper understanding of how environmental contaminants such as nitrates<\/b>, perchlorates<\/b>, and thiocyanates<\/b> interfere with iodine uptake.<\/p>\n Iodine\u2019s medical relevance continues to expand. Its radioisotopes\u2014I-123<\/b>, I-125<\/b>, and I-131<\/b>\u2014remain indispensable tools in imaging, cancer therapy, and thyroid disease management. Its chemistry still surprises, from its vivid blue reaction with starch<\/b> to its ability to exist in multiple oxidation states that may influence hormone biosynthesis. These properties underscore iodine\u2019s unique position at the intersection of chemistry, medicine, and public health.<\/p>\n Ultimately, iodine is far more than a nutrient. It is a quiet architect of human development<\/b>, a stabilizing force in endocrine physiology, and a reminder that even the smallest elements can exert extraordinary influence on human life. Ensuring adequate iodine intake\u2014through diet, supplementation, and sustained public-health efforts\u2014remains one of the simplest and most powerful strategies for protecting cognitive potential and metabolic well-being across the lifespan.[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text single_style=”” el_class=”blog-banner-section”]<\/p>\n Folate (vitamin B9) is very important for your child\u2019s brain development!<\/p>\n During pregnancy, it helps prevent neural tube defects and plays a big role in forming a normal and healthy baby\u2019s brain and spinal cord. Folate also helps cells divide and assists in both DNA and RNA synthesis.<\/p>\n Emerging research suggests that the presence of FRAAs negatively impacts folate transport into the brain.<\/p>\n Yes, there is a test – The Folate Receptor Antibody Test (FRAT\u00ae<\/sup>) has emerged as a diagnostic tool for detecting the presence of FRAAs.<\/p>\n It is important to screen at an early age or as soon as possible as there may be corrective measures available. Please consult your physician for further information.<\/p>\n To request a test kit, click on the button below.<\/p>\n Request Now<\/a><\/div>\n<\/div>\n [\/vc_column_text][vc_column_text single_style=”” el_class=”text-gray-23″]For information on autism monitoring, screening and testing please read our blog<\/a>.[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_id=”blog-references” el_class=”blog-text-35795″][vc_column][vc_custom_heading text=”References” use_theme_fonts=”yes”][vc_column_text single_style=”” el_id=”blog-ref-3564″]<\/p>\n\n
\n[\/vc_column_text][vc_column_text single_style=””]For humans and animals alike, iodine is the indispensable raw material for the thyroid hormones T\u2084 (3,5,3\u2019,5\u2019-tetraiodothyronine)<\/strong> and T\u2083 (3,3\u2019,5-triiodothyronine)<\/strong>\u2014molecules that orchestrate growth, brain development, metabolic rate, and thermal balance. A deficiency during pregnancy can irreversibly impair the developing brain, while excess intake can destabilize the delicate machinery of thyroid regulation. This narrow physiological window has made iodine both a lifesaving nutrient<\/strong> and a potential disruptor<\/strong>, depending on how\u2014and how much\u2014is consumed.[\/vc_column_text][vc_column_text single_style=””]The global struggle with iodine deficiency has been one of the most far-reaching nutritional challenges in human history. Regions with iodine-poor soil and water once saw widespread goiter, hypothyroidism<\/strong>, and cretinism<\/strong>, conditions that silently eroded health and human potential. The introduction of iodized salt<\/strong> in the 20th century stands as one of the most successful public-health interventions ever implemented, dramatically reducing the burden of iodine deficiency disorders across much of the world. Yet even today, millions remain at risk, reminding us that this element\u2019s story is still unfolding [1-6] (see Figure 1<\/strong>).
\n[\/vc_column_text][vc_column_text single_style=””]Beyond nutrition, iodine has carved a remarkable path through medicine. From early tinctures and antiseptics to modern radioisotopes<\/strong> used in imaging and cancer therapy, iodine has repeatedly reinvented its role in clinical practice. Its chemistry continues to surprise\u2014from its vivid blue reaction with starch to its ability to exist as both I\u207b<\/strong> and I\u207a<\/strong>, a versatility that underpins the synthesis of thyroid hormones themselves.
\n[\/vc_column_text][vc_column_text single_style=””]In this chapter, we explore iodine as an essential element<\/strong>, a dangerous element<\/strong>, a food element<\/strong>, a medical element<\/strong>, and ultimately an element of surprises<\/strong>\u2014a mineral whose influence spans biology, chemistry, medicine, and global health. Through this journey, the quiet power of iodine becomes unmistakable: a trace element with the capacity to shape the destiny of individuals, communities, and entire nations.
\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_id=”blog-scroll-point-2″][vc_column][vc_custom_heading text=”Iodine \u2014 The Violet Element That Shapes Human Development” use_theme_fonts=”yes”][vc_column_text single_style=””]Pronounced iyo-deen<\/em>, this element takes its name from the Greek word iodes<\/em><\/strong>, meaning violet, a nod to the striking purple vapor released by crystalline iodine. In chemistry, iodine (I\u2082)<\/strong> refers to the elemental form\u2014two iodine atoms bound together\u2014responsible for the familiar black crystals<\/strong>, violet fumes<\/strong>, and the yellow antiseptic solutions<\/strong> used in medicine. When iodine gains an electron, it becomes the more stable iodide ion (I\u207b)<\/strong>. Although these forms differ chemically, the general term \u201ciodine<\/strong>\u201d is used broadly in nutrition, medicine, and environmental science whenever the specific molecular form is not central to the discussion.
\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_id=”blog-scroll-point-3″][vc_column][vc_custom_heading text=”Essential Element \u2014 A Micronutrient With Outsized Consequences” use_theme_fonts=”yes”][vc_column_text single_style=””]Despite requiring less than 0.1 mg of iodine per day<\/strong>, humanity has struggled with deficiency for centuries. The consequences have been devastating: millions of children have been condemned to cretinism<\/strong>, a condition marked by severely impaired cognitive development<\/strong> and extremely low IQ, all because their mothers lacked this tiny but vital element during pregnancy. Iodine deficiency remains one of the leading preventable causes of intellectual disability worldwide<\/strong>.
\n[\/vc_column_text][vc_single_image image=”7329″ img_size=”full”][vc_column_text single_style=””]Table 1. Element of Life ~ Iodine in the Human Body.<\/strong>[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_id=”blog-scroll-point-4″][vc_column][vc_custom_heading text=”Element of Life \u2014 The Thyroid\u2019s Signature Mineral” use_theme_fonts=”yes”][vc_column_text single_style=””]Iodine is indispensable for humans and animals. Nearly all of the body\u2019s iodine is concentrated in the thyroid gland<\/strong>, where it forms two essential hormones:<\/p>\n\n
\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”blog-text-35795″ el_id=”blog-scroll-point-6″][vc_column][vc_custom_heading text=”Food Element \u2014 How Diet Determines Thyroid Health” el_class=”blog-text-35795″][vc_column_text single_style=””]Humans require a minimum of 70 \u03bcg of iodide per day<\/strong>, while pregnant and breastfeeding women need roughly double <\/strong>to support fetal and infant brain development.
\n[\/vc_column_text][vc_column_text single_style=””]Reference values include:<\/p>\n\n
\n[\/vc_column_text][vc_column_text single_style=””]In developed nations, dietary sources generally meet requirements. Milk<\/strong> is a major contributor, partly because iodine is added to cattle feed. Among plants, cabbages, onions<\/strong>, and mushrooms<\/strong> can accumulate up to 10 ppm (dry weight)<\/strong>. The richest natural sources include cod, oysters, shrimp, herring, lobster, sunflower seeds, seaweed<\/strong>, and mushrooms<\/strong>. A 150 g portion of haddock<\/strong> contains approximately 300 \u03bcg<\/strong> of iodine [1-6].
\n[\/vc_column_text][vc_column_text single_style=””]Certain foods\u2014such as cassava, maize, bamboo shoots<\/strong>, and sweet potatoes<\/strong>\u2014contain goitrogens<\/strong> that interfere with iodine uptake. These pose a threat primarily in regions where iodine intake is already marginal.
\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”blog-text-35795″ el_id=”blog-scroll-point-7″][vc_column][vc_custom_heading text=”Global Deficiency \u2014 A Persistent Public Health Challenge” el_class=”blog-text-35795″][vc_column_text single_style=””]In 2000, 750 million people<\/strong> in the developing world were affected by IDD, with 10 million<\/strong> suffering from cretinism. The highest-risk populations were in India<\/strong> and China<\/strong>, where centuries of intensive agriculture depleted soil iodine.
\n[\/vc_column_text][vc_column_text single_style=””]The World Health Organization (WHO)<\/strong> and UNICEF<\/strong> launched a global campaign to iodize all edible salt by 2000. Most affected countries now legally require iodization. Salt is typically fortified at 15 ppm<\/strong>, ensuring that a daily intake of 5 g of salt<\/strong> provides roughly 70 \u03bcg of iodide<\/strong>. Fortification uses either potassium iodide (KI)<\/strong> or potassium iodate (KIO\u2083)<\/strong>, the latter being more stable in hot, humid climates [1-6].
\n[\/vc_column_text][vc_column_text single_style=””]Remarkably, supplying the entire world\u2019s iodine needs would require only 175 tons per year<\/strong>. Yet deficiency persists. A 2007 report in The Lancet<\/em> noted that 500 million people in India<\/strong> still suffered from IDD, with 2 million<\/strong> cases of cretinism\u2014evidence that iodine deficiency remains a major global health issue.
\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”blog-text-35795″ el_id=”blog-scroll-point-8″][vc_column][vc_custom_heading text=”Medical Element \u2014 Iodine\u2019s Journey Through Medicine and Human Health” el_class=”blog-text-35795″][vc_column_text single_style=””]The medical story of iodine stretches back nearly 180 years<\/strong>, beginning long before its biochemical role was understood. Early physicians recognized that iodine could influence diseases of the thyroid, but the path from observation to scientific clarity was winding. Deficiency of this element leads to two of the most recognizable thyroid disorders: goiter<\/strong>, marked by a visibly enlarged thyroid gland and swollen neck, and hypothyroidism<\/strong>, a condition in which individuals become listless, fatigued<\/strong>, and unusually cold-sensitive<\/strong>. Conversely, excessive iodine intake\u2014or abnormal thyroid handling of iodine\u2014can trigger hyperthyroidism<\/strong>, characterized by restlessness, weight loss<\/strong>, and hyperactivity<\/strong> [1-6].
\n[\/vc_column_text][vc_column_text single_style=””]The first major medical use of iodine came in 1820<\/strong>, when Dr. Jean-Fran\u00e7ois Coindet (1774\u20131834)<\/strong> introduced a preparation of iodine and potassium iodide dissolved in alcohol, known as tincture of iodine<\/strong>, as a treatment for goiter. Coindet had astutely noted that traditional remedies involved consuming seaweed ash<\/strong>, a naturally iodine-rich substance, and reasoned that iodine itself must be the active agent. His insight was correct, but tincture of iodine proved too harsh: patients experienced severe stomach pain<\/strong> due to its irritant effects, and the treatment fell out of favor.
\n[\/vc_column_text][vc_column_text single_style=””]A breakthrough came in 1829<\/strong>, when Jean Lugol (1786\u20131851)<\/strong> discovered that iodine dissolves readily in aqueous potassium iodide, creating what became known as Lugol\u2019s iodine<\/strong>. This formulation was far less painful when applied to open wounds and became widely used as an antiseptic. Around the same time, physicians observed that regions plagued by goiter and cretinism<\/strong>, such as the Alps<\/strong>, had very low iodide levels in their water supply<\/strong>. Attempts to treat goiter with Lugol\u2019s iodine were eventually abandoned because excessive iodide caused adverse effects\u2014an early recognition of iodine\u2019s narrow therapeutic window.<\/strong>
\n[\/vc_column_text][vc_column_text single_style=””]The true connection between iodine and the thyroid gland emerged in 1895<\/strong>, when Dr. Eugen Baumann<\/strong> reportedly spilled concentrated nitric acid on thyroid tissue and noticed violet fumes<\/strong>, revealing the presence of iodine. Yet it was not until 1916<\/strong> that David Marine (1888\u20131976)<\/strong> of Ohio demonstrated conclusively that iodide supplementation could prevent and treat goiter<\/strong>, especially when delivered through the diet. His work laid the foundation for iodized salt<\/strong>, introduced in the United States in 1930<\/strong>, which led to the near-elimination of goiter within two decades.
\n[\/vc_column_text][vc_column_text single_style=””]Although iodine solutions failed as internal treatments for thyroid disease, they became indispensable as antiseptics<\/strong>. Tincture of iodine was widely used to disinfect wounds, long before its germ-killing properties<\/strong> were understood. Over time, gentler antiseptics replaced it, but iodine still plays a role in agriculture\u2014for example, disinfecting cow udders after milking<\/strong>. Historically, when iodine was applied before<\/em> milking, some entered the milk supply, inadvertently boosting dietary iodine intake.[\/vc_column_text][vc_column_text single_style=””]Modern medicine has expanded iodine\u2019s role far beyond antiseptics. Several radioactive isotopes<\/strong> are now essential diagnostic and therapeutic tools:<\/p>\n\n
\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”blog-text-35795″ el_id=”blog-scroll-point-12″][vc_column][vc_custom_heading text=”Take-Home Messages” el_class=”blog-text-35795″][vc_column_text single_style=””]<\/p>\n\n
\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row el_class=”blog-text-35795″ el_id=”conclusion”][vc_column][vc_custom_heading text=”Summary and Conclusions” el_class=”blog-text-35795″][vc_column_text single_style=””]Iodine remains one of the most paradoxical elements in human biology\u2014needed in only microgram quantities<\/b>, yet capable of influencing the health, cognition, and developmental trajectory of entire populations. Its essential role in the synthesis of T\u2084 and T\u2083<\/b> places it at the center of fetal brain development, metabolic regulation, and lifelong endocrine stability. When iodine is lacking, the consequences are profound: iodine deficiency continues to be the leading preventable cause of intellectual disability worldwide<\/b>, a reminder of how fragile human development can be in the absence of this trace mineral.<\/p>\nDid You Know? Folate Receptor Autoantibodies (FRAAs) may impede proper folate transport.<\/h4>\n
\n
Is there a test for identifying Folate Receptor Autoantibodies (FRAAs)?<\/h4>\n
![\"FRAT](\"https:\/\/autism.fratnow.com\/blog\/wp-content\/uploads\/2023\/12\/frat-mascot-image.webp\")
<\/div>\n<\/div>\n\n
\nhts:\/\/pubmed.ncbi.nlm.nih.gov\/19420096\/tp<\/a>
\n(A foundational review of biomarkers used to assess iodine status across populations.)<\/em><\/strong><\/li>\n
\nhttps:\/\/pubmed.ncbi.nlm.nih.gov\/36079737\/<\/a>
\n(A modern, comprehensive analysis of global iodine deficiency trends, including developed nations.)<\/em><\/strong><\/li>\n
\nhttps:\/\/journals.sagepub.com\/doi\/epub\/10.1177\/2156587211414424<\/a>
\n(Discusses the physiological consequences of deficiency and environmental antagonists such as perchlorate and bromine.)<<\/em>\/strong><\/strong><\/li>\n
\nhttps:\/\/www.who.int\/publications\/i\/item\/9789241595827<\/a>
\nhttps:\/\/iris.who.int\/server\/api\/core\/bitstreams\/82b512a6-57b8-45f3-8539-30b2f7f63564\/content<\/a>
\n(The global gold-standard reference for iodine deficiency surveillance and iodization programs.)<\/strong><\/em><\/li>\n
\nhttps:\/\/pubmed.ncbi.nlm.nih.gov\/19460960\/<\/a>
\n(A widely cited review covering iodine physiology, deficiency disorders, and global epidemiology.)<\/em><\/strong><\/li>\n
\nhttps:\/\/pubmed.ncbi.nlm.nih.gov\/22108279\/<\/a>