Acyl Coenzyme A Desaturase (commonly referred to as Stearoyl-CoA Desaturase, SCD) is an endoplasmic reticulum-bound enzyme critical for the biosynthesis of monounsaturated fatty acids (MUFAs), such as oleic acid and palmitoleic acid, from saturated fatty acids like stearic and palmitic acids. In skincare, these MUFAs are essential components of the skin’s lipid matrix, enhancing barrier function, improving hydration, and maintaining membrane fluidity. By supporting the production of lipids integral to ceramides, phospholipids, and triglycerides, SCD contributes to skin softness, elasticity, and protection against environmental stressors. Its role in regulating sebaceous gland activity also aids in balancing sebum production, making it valuable for formulations targeting dry or oily skin types. The enzyme’s activity is particularly beneficial in anti-aging products, as MUFAs help mitigate transepidermal water loss and promote a supple, youthful complexion.

In haircare, Acyl Coenzyme A Desaturase plays a pivotal role in maintaining scalp health and hair integrity by facilitating the incorporation of MUFAs into sebum and hair follicle lipids. These fatty acids nourish the scalp, reduce dryness, and enhance hair flexibility, preventing brittleness and breakage. SCD’s influence on sebocyte differentiation supports a healthy scalp environment, which is crucial for hair growth and strength. Its ability to modulate lipid composition also helps control excess oiliness, making it suitable for anti-frizz and conditioning products. By improving the lipid barrier of the scalp and hair shaft, SCD-derived MUFAs contribute to smoother, shinier hair, particularly in formulations designed for damaged or chemically treated hair.