no. According to Query 39. com, peg4 hydrogenated castor oil does not cause cancer. Hydrogenated castor oil is an accessory of medicinal down clothing, which can be used as thickener, hardener and slow-release agent. Hydrogenated castor oil is a widely used solvent in cosmetics, and is often used in ointments, creams and suppositories. Because hydrogenated castor oil is a waxy solid, it can reduce the amount of oil in product production and make the paste smoother and more delicate.