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L-Phenylalanine is an optical isomer of the essential aminoacid Phelylalanine, required for the production of tyrosine and key brain chemicals, regulating the mood, appetite, and pain. Phenylalanine is available without prescription in Australia, but it is best to get doctor's approval if considering taking it. Phenylalanine supplements may interact with other medicines and should not be taken by people suffering from phenylketonuria.