Serotonin?

Serotonin is a neurotransmitter that plays a key role in regulating mood, appetite, sleep, and other important functions in the body. It is often referred to as the "feel-good" neurotransmitter because it helps to promote feelings of well-being and happiness. Imbalances in serotonin levels have been linked to various mental health conditions, such as depression, anxiety, and obsessive-compulsive disorder. Medications that target serotonin, such as selective serotonin reuptake inhibitors (SSRIs), are commonly used to treat these conditions.