The best replacement for l-phenylalanine is dl-phenylalanine.

The best alternatives to l-phenylalanine are rated as following:
★★★★★  dl-phenylalanine
★★★★  l-tyrosine
★★  tyrosine
  d-phenylalanine
  dlpa

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l-phenylalanine
dl-phenylalanine
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