Sodium propyl para-hydroxybenzoate is a chemical compound that is commonly used as a preservative in cosmetic and pharmaceutical products. This compound is known by different synonyms, such as propylparaben sodium, E217, Nipa-Propyl Sod and p-propyl sodium benzoate. Besides, it is also used in food to extend its shelf life under different names, including n-propyl paraben sodium salt, sodium 4-hydroxybenzoate propyl, and propyl p-hydroxybenzoate sodium salt. As a preservative compound, sodium propyl para-hydroxybenzoate plays an essential role in preventing the growth and development of microorganisms in cosmetic and pharmaceutical products, improving their safety, and ensuring their efficacy. Therefore, it is essential to understand its synonyms and chemical properties to identify it accurately and use it correctly in various applications.