Question: how many types of neurotransmitters are there?
Answer: Classifying neurotransmitters is complicated because there are over 100 different ones. Fortunately, the seven “small molecule” neurotransmitters (acetylcholine, dopamine, gamma-aminobutyric acid (GABA), glutamate, histamine, norepinephrine, and serotonin) do the majority of the work.