Go natural with Home Health Hh Castor Oil (1x32 OZ). The effects of externally applied Castor Oil can be enhanced through the use of a "castor oil pack" - a piece of wool flannel saturated with the oil and applied to the body. Use of a pack allows the greatest penetration in a specific area of the body. The application of heat further increases this penetration, allowing the oil to better impart its qualities to the body.. (Note: Description is informational only. Please read the ingredient label on the product for more information and always consult your health professional with any questions prior to use.)