K8Toledo: 5-HTP is the precursor to Serotonin, and is (or was) commonly used when preloading before or after dropping MDMA (according to an alien that touched down in my backyard a few years ago).
Interesting. Googling 5-HTP as a Melatonin precursor I see that link is not as firmly established as I might have thought. In any case, that worked pretty well for me at the time before going the medical route.