Carrageenan is made from parts of various red seaweeds in the Rhodophyceae family. It's commonly used to thicken foods, but it has no nutritional value.

Carrageenan has been added to processed foods since the 1950s. Carrageenan might also help fight infections.

People use carrageenan for cough, common cold, and other conditions, but there is no good scientific evidence to support any uses.

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