As you might suspect from the name, neurotransmitters are the brain’s “chemical messengers” — transmitting important messages between nerve cells (called neurons).
Neurotransmitters come packaged in tiny bubbles called vesicles. And every millisecond, billions of your brain cells use vesicles to send signals to each other..[i]
Typically, each vesicle holds only a single type of neurotransmitter with specific functions.
For example, the neurotransmitter dopamine is associated with memory and cognitive skills.
The neurotransmitter serotonin helps regulate mood and sleep.
And the neurotransmitter, GABA, can boost mood or have a calming, relaxing effect on the nervous system.