Explains how to use medicinal herbs and oils to fight infectious illness, strengthen the immune system, combat antibiotic resistance. Most of this book discusses principles and theories concerning infectious germs, the body’s defense mechanisms, and advantages of probiotics. The quarter of it that is devoted to essential oils offers good formulas to treat 50 infections with 18 oils, although ingesting 3-5 drops essential oil 3-4 times a day is far more than an aromatherapist would recommend. Grapefruit seed is repeatedly recommended, even though its antimicrobial properties are solely due to a synthetic antibiotic, as reported in the AHA Quarterly and an American Botanical Council 2012 paper. Vasey is a naturopath whose books include The Acid-Alkaline Diet for Optimum Health.