4-Methyl-5-nonanol is primarily used in the fragrance industry due to its unique scent profile. It is often incorporated into perfumes, colognes, and other personal care products to add a fresh, green, and slightly floral aroma. Its versatility makes it suitable for both masculine and feminine fragrances, enhancing the overall olfactory experience. Additionally, it is utilized in household products like air fresheners and cleaning agents to impart a pleasant and long-lasting fragrance. Its stability and compatibility with other ingredients make it a valuable component in various formulations.