What is Serotonin Serotonin, a key neurotransmitter in the brain, can significantly impact your mood and overall sense of well-being. Serotonin helps regulate mood, emotions, and even some physical functions like sleep and appetite. When serotonin levels are low, it can lead to feelings of sadness, anxiety, and depression. Signs of Low Serotonin Mood Regulation: Serotonin plays an important role in stabilising your mood. Low levels can result in persistent low mood or mood swings. Depression: Chronic low serotonin levels are often linked to depression, characterized by intense sadness, hopelessness, and fatigue. Anxiety: Insufficient serotonin can increase feelings of anxiety and stress. Sleep Issues: Serotonin helps regulate sleep cycles. Low levels can lead to sleep disturbances, which in turn can affect your mood and energy levels. Appetite and Digestion: Serotonin also affects appetite and digestion. Low levels can lead to changes in appetite, whi...