Other compounds

Sea moss

Also called: irish moss, chondrus crispus

A red seaweed made into a gel.

Why people take it
Nutrition, thyroid.
What the evidence says
Little evidence.
How it is usually taken
Gels or capsules; iodine content varies widely.
Be careful
Iodine content varies widely; too much harms the thyroid. May contain heavy metals.
Medicines it can interact with
Iodine affects thyroid medicines.

Other other compounds

Alpha-lipoic acidResveratrolQuercetinPterostilbeneNMNSpermidineFisetinPQQSulforaphaneDIMDHEAMelatoninCaffeine and L-theanineCannabidiol (CBD)Hemp seedBee pollenRoyal jellyPropolisManuka honeyChlorophyll

Common questions

What is Sea moss?

A red seaweed made into a gel.

Why do people take Sea moss?

Nutrition, thyroid.

Does Sea moss work?

Little evidence.

How much Sea moss do people take?

Gels or capsules; iodine content varies widely.

Is Sea moss safe?

Iodine content varies widely; too much harms the thyroid. May contain heavy metals.

Does Sea moss interact with medicines?

Iodine affects thyroid medicines.

Sources and further reading

Last reviewed 31 October 2026. Written by Satya Babu.

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For information only, not medical advice. Supplements are not medicines: they are not tested and approved like drugs before they are sold, and they can interact with medicines. Talk to your doctor or pharmacist before you start one, especially if you are pregnant or breastfeeding, take regular medicines, or have kidney, liver or heart disease.