12 Foods High in Iodine (And Why Most Diets Fall Short)

The foods highest in iodine are seaweed, white fish like cod, dairy, shellfish, eggs, and iodized salt. A single serving of seaweed can supply many times your daily target, while a glass of milk or a couple of eggs makes a steady dependable contribution. The catch is that iodine is unevenly spread through the food supply, so if you have cut dairy, skipped seafood, or switched to a non-iodized specialty salt, your intake can quietly fall short even on a healthy diet. Here are twelve of the best sources and how to build enough into a normal week.

In this article

• The short answer
• 12 foods high in iodine
• Iodine content at a glance
• Why many diets still fall short
• When food is not enough
• Frequently asked questions

The short answer

To cover your 150 mcg a day from food, lean on the sea and the dairy case. Seaweed is the richest source by far, so rich that a little goes a long way. White fish, shellfish, dairy, and eggs are reliable everyday contributors, and iodized salt is the simplest top-up of all. If those foods are regular guests on your plate, you are probably close to your target. If they are not, this is exactly where intake tends to slip.

12 foods high in iodine

From richest to more modest, here are dependable sources to build into your week.

• Seaweed (nori, kombu, wakame) the single richest source, sometimes several times the daily target in one serving, so use it as a boost rather than a daily megadose.
• Cod a white fish that delivers roughly a full day's iodine in a modest fillet.
• Iodized salt a pinch supplies a meaningful, steady amount, which is why it was introduced in the first place.
• Shrimp and other shellfish good sources, because they absorb iodine from seawater.
• Milk one of the most dependable everyday sources in a typical diet.
• Greek yogurt a concentrated dairy source with a solid iodine contribution.
• Cheese another dairy option that adds up across the day.
• Eggs most of the iodine sits in the yolk.
• Tuna a convenient fish source, though a little lower than cod.
• Bread made with iodate dough conditioners some commercial breads carry a surprising amount.
• Prunes one of the better plant sources for people who eat less dairy and fish.
• Lima beans and some legumes modest plant contributors that help round out a plant-forward diet.

Iodine content at a glance

Food	Rough iodine per serving
Seaweed (varies widely)	Can far exceed 150 mcg
Cod, 3 oz	About 150 mcg
Iodized salt, 1/4 tsp	Around 70 mcg
Milk, 1 cup	About 85 mcg
Egg, 1 large	Around 25 mcg

Numbers vary with soil, feed, and processing, so treat these as a guide rather than a precise count.

Why many diets still fall short

Here is the quiet part. Several modern habits pull iodine down at once. Switching from iodized table salt to sea salt or pink Himalayan salt removes a steady source, since most specialty salts are not iodized. Cutting dairy for any reason takes out one of the most dependable everyday contributors. Plant-based and vegan diets skip fish and dairy together, leaving mostly modest plant sources. And because processed foods rarely use iodized salt, eating out or eating packaged meals does not refill the tank the way home cooking with iodized salt once did. None of these choices is wrong, but stacked together they explain why a person eating well can still run low. Our piece on whether sea salt has iodine digs into that shift.

When food is not enough

If your usual sources are thin and you would rather not force down seaweed every day, a measured supplement is a simple way to cover the gap with a known amount. A liquid you can add to water makes the daily habit easy and lets you adjust the amount, which is helpful when you are also getting some iodine from food. Whatever you choose, count food and supplement together and keep the total sensible, since more is not better with iodine. Our guide on how much iodine per day has the targets.

Frequently asked questions

What food is highest in iodine?

Seaweed is the highest, especially kombu and nori. A single serving can supply several times the daily target, which is why it is best used as an occasional boost rather than a daily megadose.

How can I get iodine without iodized salt?

Lean on dairy, eggs, white fish like cod, shellfish, and small amounts of seaweed. These cover most people's needs without relying on iodized salt.

Do vegans get enough iodine?

It can be harder, because the richest sources are fish, dairy, and eggs. Vegans should include seaweed in measured amounts or consider a supplement, and stay mindful of both too little and too much.

Is there iodine in fruits and vegetables?

Usually only small amounts, and it depends heavily on the iodine in the soil where they grew. Prunes and some legumes are among the better plant sources, but plants alone rarely cover the full daily need.

How much seaweed is too much?

Because seaweed is so concentrated, eating it daily in large amounts can push you over the safe upper limit. Enjoy it a few times a week rather than loading up every day.