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OtherNo evidence

Irish moss

Also known as: Chondrus crispus, sea moss

Irish moss is a red seaweed from which carrageenan is obtained and which contains iodine and minerals. It is popular on social media as a "superfood", but clinical studies in humans are lacking.

What it is used for

  • source of iodine and minerals – no evidence of health benefit as a supplement, content varies
  • digestive comfort and skin – no evidence, traditional use only

Forms and how they differ

powder capsules

iodine content often not stated

gel / dried seaweed

food use, a thickener

When to take it

With food.

Pairs well with

A diet with iodised salt and fish as a more stable source of iodine.

Do not combine / separate

Do not combine with other iodine supplements (kelp, multivitamins) without adding up the total.

Watch out for

With thyroid disease or thyroid hormone treatment avoid it unless your doctor agrees. During pregnancy or breastfeeding, with kidney or liver disease, or when taking medicines, consult your doctor.

Safety

The EFSA tolerable upper level for iodine is 600 µg a day from all sources; iodine content in seaweed varies greatly. Do not exceed the label dose.

Practical tip

If you need iodine, iodised salt or a supplement with an exact stated dose is more reliable.

Products containing Irish moss 1

Irish moss 400 mgsea moss · 400 mg / capsuleThyroidDigestion & gutSkin
How to read the evidence rating
Strong evidenceModerate evidenceWeak evidenceNo evidence

Strong = several good human studies or official recommendations; moderate = promising but smaller studies; weak = few studies or mixed results; no evidence = claims not confirmed.

Combination check

Select the supplements you take and, if relevant, your medicines. We show what interferes, what needs a time gap and what to watch out for.

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From the same group

AlfalfaNo evidenceAndrographisWeak evidenceAroniaWeak evidenceBarley grassWeak evidenceBee pollenWeak evidenceBeef organs (desiccated)Weak evidence
Important notice

This information is educational and does not replace advice from a doctor or pharmacist. We do not give medicine dosages. Supplements are no substitute for a varied diet; if pregnant, breastfeeding, ill or on medication, consult a doctor first.