Serotonin is a naturally existing substance in the brain. It acts as a neurotransmitter, i.e., it allows communication between the nervous system cells of the brain, called neurons. This communication is fundamental for the perception of the environment and the capacity to respond to stimuli.
Serotonin exercises an important role in the nervous system, with various functions, such as the release of some hormones, sleep regulation, body temperature, appetite, mood, motor activity, and cognitive functions.
Serotonin is one of the neurotransmitters responsible for mood. With inadequate transmission, it is normal for someone to become irritated, in a bad mood, anxious, impatient, likely to cry, etc. Improving the transmission alleviates this situation.