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WHOLE-FOOD GREENS

Sea Moss (Irish Moss)

Trace minerals · iodine · thyroid

MODERATE EVIDENCEVEGANREAD THE RESEARCH
Written to our editorial standards · reviewed against published research· Updated 5 Jun 2026
Last reviewed: May 30, 2026
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Sea Moss: Trace minerals · iodine · thyroid. A mineral-rich red seaweed used as a whole-food source of iodine and trace minerals. Standard dose 500-1,000 mg, taken in the morning, about $16/month. Evidence rating: moderate evidence.

Where to buy

SPORTSRESEARCHSea Moss90 SOFTGELSDIETARY SUPP.
RECOMMENDED
Sports Research, Sea Moss
500-1,000 mg · Morning · ~$16/month

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All product options

SPORTSRESEARCHSea Moss90 SOFTGELSDIETARY SUPP.BESTSELLER
Sea Moss
Sports Research
90 softgels · $20 · ★ 4.5
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Sea Moss
Nutricost
240 capsules · $22 · ★ 4.5
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DOUBLEWOODSea Moss120 CAPSULESDIETARY SUPP.PREMIUM
Sea Moss
Double Wood
120 capsules · $19 · ★ 4.5
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MARYRUTH'SSea Moss Capsules60 CAPSULESDIETARY SUPP.PREMIUM
Sea Moss Capsules
MaryRuth's
60 capsules · $25 · ★ 4.4
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What is Sea Moss?

Sea moss (Chondrus crispus, often sold alongside Irish moss) is a red seaweed traditionally simmered into a gel and used as a thickener and tonic. Its appeal today is as a whole-food source of iodine, potassium, magnesium, and other trace minerals, along with soluble fiber that supports gut and skin. Direct clinical evidence for the supplement itself is limited, so most claims rest on its nutrient content and traditional use rather than trials. The main caution is iodine: seaweed can carry highly variable and sometimes very high amounts, which can unsettle thyroid function, so people with thyroid conditions or who are pregnant should be careful and avoid mega-doses. Choose tested products and modest servings.

WHY IT MATTERS

A mineral-rich red seaweed used as a whole-food source of iodine and trace minerals.

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Common questions

What is Sea Moss?
Sea moss (Chondrus crispus, often sold alongside Irish moss) is a red seaweed traditionally simmered into a gel and used as a thickener and tonic. Its appeal today is as a whole-food source of iodine, potassium, magnesium, and other trace minerals, along with soluble fiber that supports gut and skin. Direct clinical evidence for the supplement itself is limited, so most claims rest on its nutrient content and traditional use rather than trials. The main caution is iodine: seaweed can carry highly variable and sometimes very high amounts, which can unsettle thyroid function, so people with thyroid conditions or who are pregnant should be careful and avoid mega-doses. Choose tested products and modest servings.
What is Sea Moss used for?
Trace minerals · iodine · thyroid. A mineral-rich red seaweed used as a whole-food source of iodine and trace minerals.
What is the standard dose of Sea Moss?
500-1,000 mg, typically taken in the morning. Approximate cost is $16 per month.
Who should avoid Sea Moss?
Use extra caution, and speak to a clinician first, if you are thyroid condition, pregnant or nursing.
How strong is the evidence for Sea Moss?
Moderate evidence for its primary uses. See the full study list on the research page.

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