The best replacement for leucine is bcaa.

The best alternatives to leucine are rated as following:
★★★★★  bcaa
★★★★★  glutamine
★★★★  hmb
★★★  isoleucine
★  leukic
★  l-leucine
★  lysine
★  leucine
  proline
  valine
  phenylalanine
  l leucine

Your alternative for leucine is not listed? Suggest!
Speaking about leucine, one probably shouldn't forget about hmb.

Other search terms related to leucine and their ratings are:
★★★★★ hmb
You have in mind a companion for leucine and it is not yet here? Propose!



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leucine
bcaa
glutamine