L-Tyrosine 90 Capsules, by Thorne Willow Bark l-5-Hydroxytryptophan is the precursor to

l-5-Hydroxytryptophan is the precursor to serotonin

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L-Tyrosine 90 Capsules, by Thorne Willow Bark l-5-Hydroxytryptophan is the precursor toL tyrosine plays an important role in the central nervous system, the thyroid, and the adrenal glands.* It is an amino acid precursor for the synthesis of the brain friendly neurotransmitters norepinephrine and dopamine.* By improving the rate of neurotransmitter production and stimulating the central nervous system, L tyrosine helps relieve the physical symptoms of stress, such as mood swings. Chronically stressed individuals might not efficiently