Diazolidinyl urea is widely used as a preservative in cosmetic and personal care products. It helps prevent the growth of bacteria, yeast, and mold, extending the shelf life of these products. Commonly found in creams, lotions, shampoos, and makeup, it ensures product safety and stability. It is particularly effective in water-based formulations, where microbial contamination is more likely. Additionally, it is often used in combination with other preservatives to enhance its antimicrobial activity. Its mild nature makes it suitable for use in products designed for sensitive skin.