I wouldn't be terribly concerned about that - the NeuroScience test measures the levels of serotonin (among many other nuerotransmitters) in the brain, then prescribes dosages of 5-htp, 7-Keto DHEA, and etc... that are appropriate for the situation. They don't just say "you're low on serotonin, take as much 5-htp as you can get your hands on."

I'm wondering about this serotonin syndrome, particularly as it relates to 5-htp. I've always understood 5-htp as being nothing more that a precursor to serotonin, and have been told (though this was some time ago) that any 5-htp ingested above and beyond what the body needs (within reason, anyway) will just not be converted into serotonin and get flushed out of the system. This part of the 5-htp wikipedia page says that it requires other drugs to be taken at the same time in order for the serotonin syndrome to arise... what've you heard on it?