L-tyrosine is commonly included in supplements intended for focus during demanding conditions. A review of controlled studies found possible cognitive benefits under stress, but judged the overall evidence insufficient for confident recommendations. It should not be treated as a guaranteed focus or performance aid.
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L-tyrosine is an amino acid used to make proteins. The body can make it from phenylalanine, and it also serves as a precursor in pathways that produce catecholamine neurotransmitters and thyroid hormones.