Think of this as the mood ring of diffusing ;). You can also wear these topically.
Essential oils work with the limbic system of the brain, also known as the "smell brain."
There are over 50,000,000 receptor neurons located in the limbic system which send a message to the olfactory bulb. These neurons were created to react to the smells and then send a message which is produced after the scent is detected and then it is used to communicate with areas of the brain that deal with our emotions, basic thought processes and behaviors.
Our sense of smell can even trigger childhood memories which shows us the power of our senses and how they can be used for our overall well being.