A friend loaned me this book since we both use essential oils and I have a history with Major Depressive Disorder. I found this book to be well-meaning nonsense. The psychological models Mein cites are not used in any effective therapy program. This is so egregious that she several times cites things as emotions that are not emotions (i.e., laughter, which is a behavior; beliefs of inferiority, which are thoughts) and uses a model of the human personality (mental vs. emotional, physical vs. spiritual) that is incomplete, and not used on its own in current psychology. Further, labeling emotions as either positive or negative contraindicates psychological best practice under the DBT model for those with depression and bipolar depression--a serious oversight in a book that claims to help direct the reader to use essential oils as a part of a therapeutic regimen for depression. While there is solid science behind the use of lavender, jasmine, and other oils as part of a depression recovery and maintenance program, none of this was cited. Instead, the reader is treated to the fuzzy science of body types, electrical frequencies, and some woo-woo spiritualism. I have no doubt that following her regimen is effective--the "apply many times a day and repeat the 'way out' would be an effective reminder that one would like to experience this emotion instead of that one, with or without the use of EOs. Simply repeating the 'way out' statement with the application of oil but without any deeper analysis and reasoning through the root causes for emotions such as anger or guilt could lead to an effective regimen of repression. Good mental health relies on our ability to identify, observe, and take responsibility for all of our emotions--not to avoid those emotions that are uncomfortable for us. The current clinical gold standard for treatment in the area of maladaptive emotional and behavior patterns (as judged by duration of recovery, rate of recidivism, and significant behavioral change) is cognitive behavioral therapy, a psychological model that is nearly universally contradicted by the precepts of Mein's program. I strongly believe in the therapeutic use of EOs as part of a holistic regimen to maintain and support good mental and emotional health. I even believe there is likely to be a certain amount truth in the oils Mein selects for various emotional states (I do know, for instance, that the oils she recommends for depression, anxiety, and mental states associated with both are independently suggested by other sources that do cite scientific evidence), but I find the psychologically basis she cites and the "feel this, not that" method of changing emotional states to be dangerously faulty. My advice: use her oil suggestions, but be very careful of pretty much anything else this book says about the human psyche.