Linked from
The 9 pages that link to Carrageenan, each with the reason it gives.
Red algaeRelated: Red-algal cell walls supply carrageenan for foods, cosmetics, and other products.
Seaweed farmingRelated: Cultivated red seaweeds provide feedstock for carrageenan processing.
AlgaeRelated: Commercial carrageenan comes from particular red seaweeds.
SeaweedRelated: Seaweed-derived carrageenan thickens and stabilizes many processed foods.
Chocolate milkRelated: Some commercial formulations use it to limit separation and improve body.