Can You Eat Seaweed When Pregnant?
Written by Jordan Morley · Reviewed against NHS foods-to-avoid guidance · Last updated 28 October 2026
Seaweed is fine occasionally in pregnancy (like in sushi), but brown seaweeds such as kelp/kombu are very high in iodine — don't eat them regularly or take kelp supplements.
Looking for a snack? MORiSH Crispy Seaweed Thins from MORiSH.
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Why is seaweed a concern in pregnancy?
Nori (the sushi wrapper) in normal amounts is fine. Brown seaweeds — kelp, kombu, wakame in quantity — contain very high levels of iodine, and excessive iodine can affect your baby's thyroid. Keep seaweed occasional, and avoid kelp supplements during pregnancy.
You can also check the calorie content of seaweed alongside its safety information. Also check medication safety during pregnancy if you're managing any conditions.
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A snack worth trying
MORiSH Crispy Seaweed Thins
A light, crunchy seaweed snack. Seaweed is high in iodine, so keep it occasional and check the label.
Get MORiSH →Want to know exactly what's in your food? Our ingredient checker covers E-numbers, allergens and vegan status.
More pregnancy essentials
Baby-safe food thermometer
Useful for pregnancy cooking checks and later for baby food.
Check Price →Seaweed: the other answers on this site
| Question | Short answer (links to the full page) |
|---|---|
| While breastfeeding | Fine in moderation |
Common questions
Can I eat seaweed in the first trimester?
Yes — Seaweed is safe at every stage of pregnancy, including the first trimester.
Is a small amount of seaweed OK during pregnancy?
No limit applies. Seaweed is not on the NHS list of foods to avoid or limit in pregnancy.
I accidentally ate seaweed while pregnant — what should I do?
No action needed. Seaweed is safe during pregnancy.
Is cooked seaweed safe in pregnancy?
Yes. Seaweed is safe in pregnancy. Only the usual rules apply: cook it properly where it needs cooking, keep chilled food chilled, and eat it before the use-by date.
Related answers
Primary source: NHS foods-to-avoid guidance.
General information only, not medical advice: see the medical disclaimer. Feeling unwell after eating something? Contact NHS 111 or your GP.