My grandma told me she has a cousin who had the same "problems" I have. Cousin's doc put her on Serotonin and it cleared her right up... as long as she remembers to take it. When she forgets she gets all messed up again.
I am on Zelnorm and I know it "acts like serotonin" (according to Zelnorm.com). But I am no where close to being normal.
Has anyone heard of taking Serotonin for IBS, or has anyone taken it (not Zelnorm, but the hormone itself)?