Is There a Link Between Seretonian and Depression?

There was no convincing evidence from any of those areas of research that there was any link with between seratonian and depression. So if we take this chemical an balanced theory of depression as a something that's unhelpful, why do you think it's persisted for so many years? I really hope that the message does get out to more people, because i think it's incredibly important that people are able to make properly informed decisions about the things that they do to their body.