4-Butylresorcinol is a derivative of resorcinol widely used in cosmetic formulations for skin brightening and anti-pigmentation. It effectively inhibits tyrosinase activity, reduces melanin oxidation, and promotes tyrosinase degradation, helping to improve uneven skin tone and enhance overall radiance.

This active ingredient is supplied as a white to off-white powder e é soluble in both oil and alcohol, making it versatile for incorporation into creams, serums, lotions, and other oil- or alcohol-based formulations. With a recommended usage of 0.1–2.2%, it provides efficient brightening effects while maintaining formulation stability.