The best replacement for l tyrosine is l phenylalanine.

The best alternatives to l tyrosine are rated as following:
★★★★★  l phenylalanine
★★★★  tyrosine
★★★★  l dopa
★★★  5 htp
★★★  dl phenylalanine
★★  acetyl l tyrosine
★  nalt
★  phenylalanine
★  dlpa
  l tyrosine
  taurine

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l tyrosine
l phenylalanine
tyrosine