Iodine Guide: Thyroid Benefits, Sources, and Overdose Risks

What Iodine Does

• Required for thyroid hormone production — there is no substitute

Without adequate iodine, the thyroid cannot produce T4 and T3 properly, which affects metabolism, energy, and development. Iodine deficiency remains a global concern despite food fortification programs.

Best Sources

• Iodised salt — the most reliable and accessible source for many people
• Seafood — fish, shellfish
• Dairy — content varies by region and farming practice

Who Might Be Low

• People avoiding seafood and iodised salt
• Those following very restrictive diets
• People using non-iodised salt exclusively (e.g., sea salt, Himalayan salt — typically not iodised)

Cautions

• Both too little and too much iodine can disrupt thyroid function — this is different from most minerals
• If you have thyroid disease (Hashimoto's, Graves', etc.), be particularly cautious with iodine supplements — get guidance first
• High-dose iodine supplements are not generally recommended without medical oversight

FAQ

Can I just take kelp tablets? Be careful — kelp can be extremely high in iodine and the content is difficult to verify. It's easy to overshoot.

Do I need iodised salt? It's a helpful option if your diet is low in seafood and dairy. Most people using iodised salt in cooking get adequate iodine without supplementing.

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Disclaimer: Educational content only — talk to a clinician for medical advice.

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