Irish moss is a red seaweed that supplies carrageenan and minerals. People take it to support immune and digestive health, soothe mucous membranes, and provide iodine for the thyroid.
The dried seaweed is soaked and eaten as a gel blended into smoothies or soups. Powders and extracts are taken with water or juice. Its high iodine content means sensitive individuals should be cautious, since too much iodine can disturb thyroid function.