I've been taking tyrosine for a few weeks with some results and want to try tryptophan as well. Unfortunately tryptophan is very very expensive and I ended up relying on the tryptophan in an egg-white powder mix I am currently taking. I might start tryptophan supplements if I can find them cheap enough.
The history of tryptophan supplements is quite disturbing, and how it was banned right before prozac came out.