15 Feb 2016 --- Carrageenan is a natural, seaweed-based emulsifier and stabilizer that has been used in processing foods for over 100 years. In the recent past, carrageenan has been a key ingredient in processed foods from sandwich meats to dairy-based foods. Its use is most popular in yoghurts, milk and ice cream. However, scientific studies suggesting that carrageenan is toxic to the immune system and digestive tract, and a potential carcinogen have meant that food manufacturers have reformulated many of their products in order to eliminate the stabilizer and reassure consumers that there are no risks in consuming their products.