Cyclohexane

Cyclohexane is a volatile organic solvent—a clear, colourless liquid derived from petroleum. In skincare formulations, it functions primarily as a solvent, meaning it dissolves other ingredients to create a uniform, stable product. Its role is largely technical rather than therapeutic; it helps formulators combine ingredients that would otherwise be incompatible.Once applied to skin, cyclohexane evaporates quickly, leaving behind the active ingredients it carried. It appears in a very small proportion of skincare products, typically as a supporting ingredient rather than a primary component.

Cyclohexane works as a solvent by dissolving polar and non-polar compounds within a formulation, allowing ingredients with different chemical properties to coexist in a single product. This is particularly useful in skincare where active ingredients often have vastly different solubility requirements.Upon application, cyclohexane rapidly evaporates from the skin surface due to its volatile nature, leaving behind the dissolved actives to perform their intended functions. This evaporation is why you may notice a slight cooling sensation with products containing this solvent.

Cyclohexane-containing products should be used as directed by the manufacturer. Because the ingredient evaporates quickly, there is no need for special application technique; standard skincare application methods will work effectively. If you use products containing multiple solvents, layering them is fine—simply apply as per your routine.

Cyclohexane is generally recognised as safe for use in cosmetics at the concentrations found in skincare products. As with all volatile solvents, products containing cyclohexane should be stored in well-sealed containers away from excessive heat to prevent evaporation and degradation.