Reference:E. Joy Bowles(2004, April), The Chemistry of Aromatherapeutic Oils, Allen & Unwin Academic; 3rd edition
CH01 WHAT IS CHEMISTRY
CH02 PLANTS AND ESSENTIAL OILS
CH04 FUNCTIONAL GROUPS_1 _2
CH04e PROCESSING, EXTRACTION AND PURITY
CH05 THE PHARMACOLOGY OF ESSENTIAL OILS_1 _2
Ch06 QUALITY CONTROL
Prescription because well as Otc medications will give almost instant comfort however long-member usage can lead to side goods such as damage to your kidney and liver means.