Cholesteryl sodium sulfate is primarily used in the formulation of cosmetic and personal care products due to its emulsifying and stabilizing properties. It helps in blending oil and water-based ingredients, making it essential in creams, lotions, and shampoos. Additionally, it enhances the texture and consistency of these products, providing a smooth and even application. Its role in stabilizing formulations ensures longer shelf life and maintains product integrity. In some cases, it is also utilized in research applications as a surfactant in biochemical studies.