Used primarily in cosmetics and skincare products for its excellent moisturizing properties, squalene helps maintain skin hydration and supports the natural lipid barrier. It is easily absorbed and often found in facial creams, serums, and lip products due to its non-greasy texture. Its antioxidant properties also help protect the skin from environmental stressors and premature aging. In pharmaceuticals, squalene serves as an adjuvant in some vaccine formulations, enhancing the body's immune response. This application is particularly notable in certain influenza vaccines. It is valued for improving vaccine efficacy while maintaining a favorable safety profile. Additionally, squalene is used in dietary supplements for its potential immune-supporting and cholesterol-lowering effects. Though naturally produced in the human body, levels decline with age, prompting interest in its supplemental use. It is also utilized in hair care products to condition and add shine, especially in formulations for dry or damaged hair.