sec-Butyl 4-Hydroxybenzoate is widely used as a preservative in the cosmetic and personal care industry. It helps to prevent the growth of bacteria, fungi, and yeast in products like lotions, creams, and makeup, ensuring their shelf life and safety for consumers.

In the pharmaceutical sector, it is utilized as an antimicrobial agent in various formulations, including ointments and oral medications, to maintain product integrity and prevent contamination.

Additionally, it finds application in the food industry as a preservative, particularly in processed foods and beverages, to inhibit microbial growth and extend product freshness. Its effectiveness in low concentrations makes it a popular choice for preserving a wide range of consumer goods.