I absolutely believe it and use it every day in my household by using a diffuser so that everyone in my house benefits from it and it also purifies and cleanses the air in your home. It works like magic, especially if you want to use it to have restful sleep or to keep all the bugs, viruses and sicknesses away Essential oils work with the limbic system, the emotional center of your brain. It is connected to the part of your brain that controls heart rate, blood pressure, memory, breathing, stress levels, even your congestion. Each of these is easily treatable with essential oils. The amygdala (part of the brain that stores and interprets emotion)plays a crucial role in the development and expression of negative mood. The right essential oil can act on the particular part of your amygdala that is associated with these issues. The unique molecular structure of an essential oil allows it to enter the bloodstream fast and produce quick and potent results. Essential oils can be a powerful influence on the limbic system, regulating emotions in ways the conscious mind may not do as efficiently. Here is a link to one of the amazing videos of Josh Axe where he talks about essential oils and cancer.

Hope that was helpful. @joalvarez I also share the basic info in some of my post about essential oils if you were interested