Great tips in this article for preventing (and beating) the blues.

For the more serious cases, there are some great alternative therapies administered by certain naturopaths (those who also offer chealation). Treatments that have no side effects (only good ones like giving you more energy etc.) and are basically intravenous vitamin therapies really boost brain chemicals and remove the dark clouds. I did read a lot about it and helped someone I know through them and the person is now feeling great and is back to work after many years of battling depression (and after many years with no results from the regular medications).