I'd like to share with you my experience using 5HTP to deal with PAWS (Post Acute Withdrawal Syndrome).
I'm a two-year opiate addict who has been clean since Jan 7, 2010. The post-withdrawal phase of this recovery has had full reign over my emotions and I have been unable to form plans or motivate myself to do much more than stare at the TV.
When I first quit opiates, I tried 5HTP with the thought that it would alleviate some of the symptoms. It didn't. In fact, I found myself even more anxious than before. When I quit 5HTP, the anxiety went away.
Now that I am in the later phases of the recovery, I have tried taking one recommended dose unit of 5HTP each morning with breakfast.
It seems to have had a profound impact on my ability to function. I feel a definite change in mood. At first it seemed like anxiety all over again, but now I recognize that this "anxiety" is in fact motivation. The drug seems to help me connect my thoughts to actions and my actions to foreseeable consequences. This feeling had become foreign to me, but now I recognize it as a good thing.
Of course I can't be sure it is the drug-- I may just be having a mood swing, or there may be a placebo effect-- so if anyone has references to any research literature on the topic I'd love to read it.