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L-Tyrosine ((S)-Tyrosine) is a naturally occurring tyrosine and is synthesized in vivo from L-phenylalanine, considered a non-essential amino acid. L-Tyrosine(L-p-Tyrosine) is the levorotatory isomer of the aromatic amino acid tyrosine.

L-Tyrosine (Standard) can be used for quantitative analysis and related studies.L-Tyrosine is a non-essential amino acid that is a precursor to catecholamines and thyroid hormones, and is involved in neurotransmitter synthesis, hormone regulation, and immunity through its action on a variety of enzymes and transporter proteins.L-Tyrosine affects dopamine (DA) synthesis and release to regulate cognitive function.