Thyroid health evidence brief
Iodine is essential for thyroid hormone production and correcting low intake matters, especially around pregnancy, but routine extra iodine is not automatically better.
WHO supports salt iodization to prevent deficiency disorders; pregnancy reviews show clearer benefit in severe deficiency than in mild or sufficient populations.
Needs are usually met through iodized salt, seafood, dairy, eggs, or prenatal formulas; supplement dose should reflect diet, pregnancy status, and thyroid history.
Both too little and too much iodine can disrupt thyroid function. Thyroid disease, pregnancy, and medication use make clinician guidance important.
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