Neurotransmitters are chemical messengers that send signals in the brain and nervous system. They communicate with one another in relation to their effects on mood disorders, hormones, sleep, glucose/insulin balance, pain perception, appetite and cognitive function.

The Neurotransmitter-Intermediate Profile is a four point urine analysis test, assessing levels of nine neurotransmitters which include: Serotonin, GABA, Dopamine, Noradrenaline, Adrenaline, Glutamate ratio, PEA, Glycine and Histamine.