The castor oil pack is one of the best applications and uses of castor oil. The pack is most commonly used over the abdomen and the liver. This is because the greatest concentration of lymphatic tissue is located in these areas of the body. In order to perform a proper castor oil pack, you apply a layer of oil over the abdomen and liver. Then you apply the cotton flannel over top of the oil. The flannel acts as an insulator to warm the oil and penetrate it into the body. As the oil penetrates, i