Neurotransmitters are chemical messengers in the brain that can send excitatory or inhibitory signals for neurons to generate an electrical impulse or not. These are molecules that are produced, stored, and released in and from neurons to the synapse.

Here we have 3 that may represent people more:

Adrenaline: Adrenaline is a hormone and neurotransmitter that boosts energy and alertness, helping the body respond quickly to stressful situations.

Happiness or serotonin: It is a positive emotional state characterized by feelings of satisfaction, joy and general well-being, resulting from a combination of internal and external factors that affect the mind and body.

Dopamine: It is the hormone of pleasure and reward, it is released when we do something that we like or that gives us satisfaction.