This is my new favorite supplement. I have been taking it for a week and notice a huge increase in mood, energy and general well being. I havent slept this well in years and my strength is up.
L-Tryptophan isn't available anymore by itself as a supplement (some early 90's left wing health ban shit, produced from bacteria and couple of batches were dirty)
You might be talking about 5-HTP, which is a derivative. Very good to increase your mood indeed. Raise Serotinine levels very fast. Also good for insomnia if taken before bedtime.
My favorite combo is 50mg 5-HTP + 6mg of Melatonin, 30mins before going to bed. Knocked the fuck out!