Leucyl-phenylalanine is widely used in the cosmetics and skincare industry due to its peptide structure, which helps in improving skin elasticity and reducing the appearance of wrinkles. It is often incorporated into anti-aging formulations to promote collagen production and enhance skin firmness. Additionally, it is utilized in hair care products to strengthen hair fibers and improve overall hair health. Its ability to act as a conditioning agent makes it a valuable component in moisturizers, serums, and creams designed for skin and hair rejuvenation.