The best replacement for l-tryptophan is 5-htp.

The best alternatives to l-tryptophan are rated as following:
★★★★★  5-htp
★★★  tryptophan
★★  5-hydroxytryptophan
★★  5 htp
★  l-theanine
★  l-tyrosine
★  5htp
  htp5
  5 hydroxytryptophan 5htp

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Speaking about l-tryptophan, one probably shouldn't forget about 5 htp.

Other search terms related to l-tryptophan and their ratings are:
★★★★★ 5 htp
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