Dr. William McGarey has used castor packs for over 30 years in his medical practice. His book, The Oil that Heals, is a detailed text on McCarey's research on the history of castor packs and their miraculous effect on such diseases as cancer, hepatitis, arthritis, migraines, and digestive disorders. McGarey integrates much of Edgar Cayce's knowledge of the miraculous castor plant and his extraordinary knowledge of the human body and physiology. The book is well researched and filled with case histories from patients and physicians. The Oil that Heals is a must-read for any one serious about healing their body and getting maximum benefits from this ancient oil.