Highly recommended to anyone that has an interest in aromatherapy and the energetic and vibrational aspects of essential oils. Kelly Holland Azzaro, Past President of the National Association for Holistic Aromatherapy "An excellent resource . . . Kac's work is thorough, easy to understand, and gives you the depth to want to delve into using oils on a regular basis." Ann Boroch, CNC, award-winning author of The Candida Cure.