Iodine plays a critical role in supporting thyroid function, but getting too much of it can be just as risky as not getting enough.
Health authorities recently raised concerns after discovering that certain multivitamins contained more than double the labeled iodine content. While iodine is vital for producing thyroid hormones, consistently high intake can disrupt the delicate hormonal balance that regulates metabolism, growth, and energy levels.
For most adults, the recommended daily intake of iodine is around 150 micrograms. Pregnant or breastfeeding individuals may need slightly more, but regularly exceeding 1,100 micrograms a day is considered excessive and potentially harmful.
Many unknowingly inch toward this upper limit by combining supplements with iodine-rich foods, like seaweed, shellfish, or iodized salt. In these cases, even a single high-dose supplement can tip the scale.
The thyroid gland is susceptible to changes in iodine levels. An excess can trigger hypothyroidism, where the gland underperforms, or, in rare instances, hyperthyroidism, where it becomes overactive.
Symptoms of hypothyroidism include sluggishness, weight gain, and sensitivity to cold, while hyperthyroidism may cause anxiety, insomnia, rapid heartbeat, and tremors. In both cases, excess iodine can also lead to thyroid inflammation or the formation of nodules.
Children are especially vulnerable due to their smaller body size, and during pregnancy, excess iodine can interfere with fetal thyroid development. That’s why medical experts recommend that expecting mothers speak with a doctor before using any iodine-containing supplements.
Although the body typically flushes out excess iodine through urine, a continuous high intake can still pose serious health risks over time. Individuals with pre-existing thyroid conditions or a family history of thyroid disease should be especially cautious.
More isn’t always better. Moderation is key in iodine intake, whether from diet or supplements. Regular thyroid checkups can help catch issues early, before symptoms become more serious.
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