I am attaching a link to a very good explanation of the use of serotonin in the gut. The gut uses much more of it than the brain folks! So for those who re dealing with gut issues serotonin is a serious thing to consider. Actually the guy could continue to function if it were neurologically cut off from the brain and this is due to the action of SEROTONIN in the gut!
So you are definitely on to an interesting idea, depending on what a person's particular malady is.
Here's the link: http://nutritionwonderland.com/2009/06/understanding-bodies-serotonin-connect...
hope that is of interest. and don't forget there are a lot of ways of raising serotonin levels in addition to the pills.
best wishes, Ms. Rancid:)