For any substance the body needs to utilize inside the cell, there is a specific lock and key cell surface receptor involved. For example, serotonin is a neurotransmitter. You can have adequate levels of serotonin in the blood, and on the outside of the cell, but have something blocking the utilization of serotonin at the level of the cell surface. This scan shows you how to find and clear these issues. All the body's hormones, peptides, steroids, and neurotransmitters are involved as well as many things western medicine has not yet discovered.