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Iodine Supplementation – Treating Iodine Deficiency

Iodine supplementation refers to the targeted intake of iodine to prevent or treat iodine deficiency. It is essential for healthy thyroid function.

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Things worth knowing about "Iodine Supplementation"

Iodine supplementation refers to the targeted intake of iodine to prevent or treat iodine deficiency. It is essential for healthy thyroid function.

What Is Iodine Supplementation?

Iodine supplementation refers to the deliberate intake of iodine through dietary supplements, iodized table salt, or medications to prevent or correct iodine deficiency. Iodine is an essential trace element that the human body cannot produce on its own and must therefore obtain through diet or supplementation.

The Role of Iodine in the Body

Iodine is indispensable for the production of the thyroid hormones thyroxine (T4) and triiodothyronine (T3). These hormones regulate metabolism, growth, nervous system development, and many other bodily functions. Prolonged iodine deficiency leads to an enlarged thyroid gland (goiter) and, in severe cases, can cause an underactive thyroid (hypothyroidism).

Causes of Iodine Deficiency

Low iodine content in soil and drinking water (common in landlocked regions and mountainous areas)
Unbalanced diet with little seafood, fish, or dairy products
Increased iodine requirements during pregnancy and breastfeeding
Vegan or vegetarian diets without targeted iodine supplementation
Avoiding iodized salt

Who Needs Iodine Supplementation?

The following groups benefit most from targeted iodine supplementation:

Pregnant and breastfeeding women: Iodine requirements increase significantly during these stages, as iodine is essential for fetal brain development.
Infants and toddlers: Particularly when exclusively breastfed and the mother has insufficient iodine intake.
People in iodine-deficient areas: Large parts of Central Europe, including Germany, Austria, and Switzerland, have naturally low iodine levels in soil and water.
Individuals following a vegan diet: Plant-based foods generally contain little iodine.
Patients with thyroid conditions: Only under medical supervision, as specific rules apply depending on the condition.

Forms of Iodine Supplementation

Iodized Table Salt

The simplest and most widespread form of iodine supplementation is the use of iodized table salt. In many countries, salt is legally fortified with iodine to ensure adequate population-level intake.

Dietary Supplements

Iodine-containing dietary supplements, commonly available as potassium iodide, are especially recommended during pregnancy and breastfeeding. The German Nutrition Society (DGE) recommends a daily iodine intake of 230 µg for pregnant women and 260 µg for breastfeeding women.

Medical Iodine Therapy

In cases of diagnosed iodine deficiency or for the treatment of certain thyroid conditions, iodine may also be prescribed as potassium iodide tablets by a physician.

Recommended Daily Intake

The World Health Organization (WHO) and leading nutrition societies recommend the following daily iodine intake:

Adults: 150 µg/day
Pregnant women: 200–230 µg/day
Breastfeeding women: 200–260 µg/day
Children (depending on age): 40–120 µg/day

Risks and Side Effects

Excessive iodine intake (iodine excess) can also be harmful. Overdosing may trigger an overactive thyroid (hyperthyroidism) or worsen existing autoimmune thyroid diseases such as Hashimoto thyroiditis. For this reason, iodine supplementation should always be discussed with a healthcare provider in individuals with known thyroid conditions. The European Food Safety Authority (EFSA) sets the Tolerable Upper Intake Level (UL) for adults at 600 µg/day.

Iodine Supplementation During Pregnancy

Adequate iodine supply during pregnancy is critically important. Iodine deficiency at this stage can lead to cretinism (severe mental and physical developmental disorder in the child), miscarriage, and low birth weight. For this reason, medical associations recommend taking iodine-containing prenatal vitamins or separate iodine supplements from the beginning of pregnancy, ideally starting during family planning.

References

World Health Organization (WHO): Assessment of iodine deficiency disorders and monitoring their elimination. 3rd edition, Geneva 2007.
Zimmermann MB: Iodine deficiency. Endocrine Reviews, 2009; 30(4): 376–408. PubMed PMID: 19460960.
European Food Safety Authority (EFSA): Dietary reference values for iodine. EFSA Journal, 2014; 12(5): 3660.

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