Which neurotransmitter is primarily associated with mood regulation?

The neurotransmitter primarily associated with mood regulation is serotonin. Research has shown that serotonin plays a crucial role in influencing mood, emotion, and overall well-being. It is often referred to as the "feel-good" neurotransmitter due to its significant impact on feelings of happiness and contentment. Low levels of serotonin have been linked to mood disorders such as depression and anxiety, highlighting its importance in maintaining emotional balance.

This role in mood regulation is supported by various studies and is one reason why serotonin reuptake inhibitors (SSRIs), which increase serotonin levels in the brain, are commonly prescribed to treat depression and anxiety disorders. This underscores serotonin's central position in the biological basis of mood and emotional health.