• Mood - Serotonin is often called the body's natural "feel-good" chemical. It's also why it's often a target of medications that are used to treat depression, anxiety, etc.
• Digestion - Serotonin contributes to normal bowel function and reduces your appetite to help you know when you're full.
• Blood Clotting - Increased serotonin levels cause the tiny arteries to narrow - a crucial step in the process of wound healing.
• Sexual Function - High serotonin levels have been linked to a decrease in sexual desire.

Serotonin (also known as 5-hydroxytryptamine or 5-HT) is a naturally occurring substance that functions as a neurotransmitte to carry signals between nerve cells (called neurons) throughout your body.

Most commonly, people are aware of serotonin's role in the central nervous system (CNS).