Displaying 8 results of Serotonin Impurities Serotonin is a neurotransmitter that plays a vital role in regulating mood, anxiety, and sleep. However, impurities in serotonin can impact its effectiveness and lead to various health issues. Serotonin impurities can be caused by a variety of factors, including poor diet, certain medications, and genetic mutations. Identifying and addressing these impurities is important for maintaining optimal mental health and overall well-being.