Alaria

BotanicalSeaweedBest with a meal

What is it

Alaria (most commonly Alaria esculenta, also known as Atlantic wakame or dabberlocks) is an edible brown seaweed harvested from cold North Atlantic waters. It is used as a food and as a supplement ingredient for its mineral content, particularly iodine.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Iodine and mineral support

Limited Evidence

Alaria provides iodine and a mix of minerals, which can be useful in regions or diets low in seafood. Iodine variability and the risk of excess are real concerns; documented benefit is dose-dependent.

How it works

Like other brown seaweeds, Alaria provides iodine - an essential mineral for thyroid hormone production. It also contains sodium alginate (a soluble fiber), fucoidan polysaccharides, fucoxanthin pigments, and a range of minerals including calcium, magnesium, iron, and potassium. Fucoidans and other seaweed polysaccharides have been investigated in laboratory studies for antioxidant, anti-inflammatory, and immune-modulating effects. The alginates can bind dietary cholesterol and bile acids in the gut, potentially contributing to mild cardiovascular benefits. Human evidence specifically for Alaria, however, is limited compared with more studied seaweeds such as kelp or wakame.

Dosage

There is no established dose. Supplements typically provide 250-1000 mg of dried Alaria powder per serving. Iodine content varies widely by batch and species, which is the primary safety consideration. DSLD label data did not include a median dose.

When and how to take it

WHEN: Take Alaria with meals to minimize gastrointestinal upset. If used for iodine, consistent daily intake matters more than time of day. HOW: As capsules, powders, or whole dried fronds added to soups and broths.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Dried Alaria frond/powder

Sold as whole dried fronds, flakes, or encapsulated powder.

Iodine is reasonably bioavailable; mineral content varies by batch.

Safety

Edible brown seaweeds can contain very high iodine levels and may also concentrate arsenic from seawater. Excess iodine can cause both hyperthyroidism and hypothyroidism. Choose products that report iodine content per serving. Allergic reactions to seaweeds occur but are uncommon.

Who should be cautious

People with hyperthyroidism, Hashimoto's thyroiditis, or a history of thyroid cancer should consult their clinician before using seaweed supplements. Pregnant and breastfeeding people should be cautious because excess iodine can affect fetal and infant thyroid function.

Interactions

Iodine intake from seaweed can interact with thyroid medications (levothyroxine), antithyroid drugs (methimazole, propylthiouracil), and amiodarone. Discuss seaweed supplementation with a clinician if you take any thyroid-affecting medication.

Food sources

Dried Alaria (Atlantic wakame)

Amount
~5 g serving; iodine highly variable
%DV
—

Frequently asked questions

How much iodine is in Alaria?⌄

Iodine content varies dramatically between batches and species. Reputable suppliers test and report iodine per serving. Without testing, dosing iodine from seaweed is unpredictable.

Is Alaria the same as wakame?⌄

Alaria esculenta is sometimes called 'Atlantic wakame' but is a different species from true wakame (Undaria pinnatifida). They are related brown seaweeds with similar uses.

References

Alaria on Wikidata — Wikidata link

Alaria on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Alaria (PubMed search) — PubMed link

Track Alaria with Pilora

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.