Isoamyl 4-Hydroxybenzoate is widely used as a preservative in cosmetics, personal care products, and pharmaceuticals. It helps prevent the growth of bacteria, fungi, and yeast, extending the shelf life of these products. In the food industry, it serves as an antimicrobial agent to maintain freshness and safety in various food items. Additionally, it is utilized in industrial applications to protect materials from microbial degradation. Its effectiveness in low concentrations makes it a popular choice for preserving a wide range of products.