Propylene Glycol Alginate (PGA) is a derivative of alginic acid, a natural polysaccharide obtained from brown seaweed. It is a water-soluble compound that is commonly used in various industries due to its unique properties such as emulsification, stabilization, and gelling. Propylene glycol (PG) is chemically combined with alginate to improve its solubility in water and enhance its functionality in specific applications.