Iodine and Multivitamin: Can You Take Them Together?

Notable interaction — check before combining

Iodine and Multivitamin can interact. Where both products contain iodine, the combined amount can pass the upper limit. Iodine excess can cause underactive or overactive thyroid, and people with autoimmune thyroid disease or thyroid nodules are more sensitive to it. Check the iodine content of both labels, and count iodised salt and seaweed, then add them. Keep the total within 600 mcg a day, the EU upper limit. People with autoimmune thyroid disease should not add a standalone iodine supplement to a multivitamin that contains iodine without their clinician.

What the evidence says

moderateconflict· moderate evidence

Multivitamins contain varying amounts of iodine, often 75-150 mcg, and some contain none. A standalone iodine or kelp supplement adds to it. The adult upper limit is 600 mcg a day in the EU and 1,100 mcg a day in the US.

What to do: Check the iodine content of both labels, and count iodised salt and seaweed, then add them. Keep the total within 600 mcg a day, the EU upper limit. People with autoimmune thyroid disease should not add a standalone iodine supplement to a multivitamin that contains iodine without their clinician.

Dose matters: Combined iodine from all sources above 600 mcg a day (EU) or 1,100 mcg a day (US), or any added iodine with autoimmune thyroid disease. Minimal risk: An iodine-free multivitamin, or a combined total well within the upper limit.

Iodine

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Multivitamin

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Frequently asked questions

Can you take Iodine and Multivitamin together?: Iodine and Multivitamin can interact. Where both products contain iodine, the combined amount can pass the upper limit. Iodine excess can cause underactive or overactive thyroid, and people with autoimmune thyroid disease or thyroid nodules are more sensitive to it. Check the iodine content of both labels, and count iodised salt and seaweed, then add them. Keep the total within 600 mcg a day, the EU upper limit. People with autoimmune thyroid disease should not add a standalone iodine supplement to a multivitamin that contains iodine without their clinician.
Do Iodine and Multivitamin interact?: Where both products contain iodine, the combined amount can pass the upper limit. Iodine excess can cause underactive or overactive thyroid, and people with autoimmune thyroid disease or thyroid nodules are more sensitive to it. Multivitamins contain varying amounts of iodine, often 75-150 mcg, and some contain none. A standalone iodine or kelp supplement adds to it. The adult upper limit is 600 mcg a day in the EU and 1,100 mcg a day in the US.
Should you separate Iodine and Multivitamin?: Check the iodine content of both labels, and count iodised salt and seaweed, then add them. Keep the total within 600 mcg a day, the EU upper limit. People with autoimmune thyroid disease should not add a standalone iodine supplement to a multivitamin that contains iodine without their clinician.

This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.

What the evidence says

moderateconflict· moderate evidence

Frequently asked questions

Can you take Iodine and Multivitamin together?

Do Iodine and Multivitamin interact?

Where both products contain iodine, the combined amount can pass the upper limit. Iodine excess can cause underactive or overactive thyroid, and people with autoimmune thyroid disease or thyroid nodules are more sensitive to it. Multivitamins contain varying amounts of iodine, often 75-150 mcg, and some contain none. A standalone iodine or kelp supplement adds to it. The adult upper limit is 600 mcg a day in the EU and 1,100 mcg a day in the US.

Should you separate Iodine and Multivitamin?

Check the iodine content of both labels, and count iodised salt and seaweed, then add them. Keep the total within 600 mcg a day, the EU upper limit. People with autoimmune thyroid disease should not add a standalone iodine supplement to a multivitamin that contains iodine without their clinician.