Microbes help produce serotonin in gut, where it is estimated that 90% of the body's serotonin is made.
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Nice advancement by Caltech:
Although serotonin is well known as a brain neurotransmitter, it is estimated that 90 percent of the body's serotonin is made in the digestive tract. In fact, altered levels of this peripheral serotonin has been linked to diseases such as irritable bowel syndrome, cardiovascular disease, and osteoporosis. New research shows that certain bacteria in the gut are important for the production of peripheral serotonin.
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