Serotonin levels in the gut?

Serotonin in the gut is a significant component of our body's overall serotonin levels. Andrew Huberman discusses the production of serotonin by the gut microbiota and how this contributes to baseline levels of serotonin, which can affect mood and well-being. When these microbiota are allowed to thrive in a well-maintained gut environment, they can increase overall serotonin levels, while deficiencies in these bacteria can negatively impact mood. It is estimated that 90 to 95% of our serotonin is produced in the gut, reflecting the substantial role of gut health in our overall serotonin balance 1.