Alginic Acid is a complex polysaccharide found in the cell walls of brown algae. It is widely used in the food industry as a gelling agent, thickener, and stabilizer. Some of the common synonyms for alginic acid include algin, alginates, and sodium alginate. Alginic acid is also known as E400, which is its official E number for food additives in the European Union. Other similar terms that are often used in connection with alginic acid include seaweed-derived products, marine polysaccharides, and carrageenans. Alginic acid has a wide range of applications in the food industry, including use in dairy products, salad dressings, and baked goods.