Octadecyl gallate is widely used as an antioxidant in the food industry, helping to prevent the oxidation of fats and oils, thereby extending the shelf life of products. It is also employed in cosmetics and personal care items to stabilize formulations and protect against degradation caused by exposure to air and light. In the pharmaceutical sector, it serves as a preservative to maintain the efficacy and stability of certain medications. Additionally, it finds application in industrial lubricants and plastics, where it inhibits oxidative breakdown, enhancing the durability and performance of these materials.