Does your prenatal vitamin contain enough iodine?
Many prenatal vitamins contain little or no iodine — a nutrient vital for your baby’s brain.
Medically reviewed by Dr. Christopher Sterling, obstetrician ·
The short answer
Iodine needs rise in pregnancy because it’s essential for the baby’s brain development. The American Thyroid Association recommends a daily supplement containing 150 micrograms of iodine during pregnancy and breastfeeding, but many prenatal vitamins contain less or none. Check the label.
Why it matters
Your thyroid uses iodine to make hormones that direct your baby’s brain and nervous system development. Even mild deficiency in pregnancy has been linked to lower cognitive scores in children.
Main sources are dairy, fish, eggs and iodised salt. Plant-based milks usually aren’t fortified with iodine, so vegans and people who avoid dairy are at higher risk.
More isn’t better: kelp and seaweed supplements can contain far too much iodine and are not recommended.
What to do
- Check your prenatal vitamin for iodine (look for about 150 mcg).
- If you’re plant-based, choose an iodine-fortified milk alternative or ask about a supplement.
- Avoid kelp/seaweed supplements.
Common questions
Should I take an iodine supplement in pregnancy?
Many experts recommend a prenatal vitamin with 150 mcg iodine. Recommendations differ by country, so ask your midwife or doctor.
Sources
Medically reviewed by Dr. Christopher Sterling, obstetrician, on against the sources above. Guidance can differ between countries — always follow the advice of your own midwife, doctor or pharmacist. Medical disclaimer.
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