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L-Tyrosine - Tyrosine is a nonessential amino acid (protein building block) that the body synthesizes from phenylalanine, another amino acid. Tyrosine's main purpose is to support the formation of neurotransmitters. Neurotransmitters are important because they carry "messages" from one nerve cell to another and play a vital role in our muscular function. Buy L-Tyrosine Supplements on Discount at HerbsMD.