The combination of Clove, Cinnamon, Rosemary, Lemon and Eucalyptus has been around for some time. Legend has it that during the 15th century the Bubonic plague had cause many to lose their lives. Theives would go around stealing from dead persons bodies, but somehow they never contracted the disease. Supposedly because they were taking these essential oils. I use this on the bottom of my feet at bedtime and also my neck and chest...even if i start to sniffle a bit or if I come in contact with someone who may be coming down with something.