The best replacement for l-glutamine is glutamine.

The best alternatives to l-glutamine are rated as following:
★★★★★  glutamine
★★★  bcaa
★★  glutamic acid
★★  glutamate
★★  glutathione
★  glutamax
★  glutamine peptides
★  l-theanine
★  gaba
★  l-glutamine
★  l-glutathione
★  l-glutamic acid
★  micronized
★  glutamine peptide
  l-arginine
  l-carnitine
  micronized glutamine
  glutamine akg

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Speaking about l-glutamine, one probably shouldn't forget about bcaa.

Other search terms related to l-glutamine and their ratings are:
★★★★★ bcaa
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