L-PhenylalanineL-Phenylalanine is an essential amino acid and is a precursor for L-tyrosine, monoamine neurotransmitters (Dopamine, Norepinephrine and Epinephrine) and melanin. Supplemental L-phenylalanine is commonly used in depression and as an analgesic. High amounts of L-phenylalanine are found in soy, eggs, red meat and fish.
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