100 Tablets, 500 mg, Source Naturals L-TyrosineSource Naturals LTyrosine, 100 Tablets, 500 mg, is a freeform amino acid supplement designed to support brain function and neurotransmitter production. LTyrosine crosses the bloodbrain barrier and serves as a precursor for dopamine, norepinephrine, and epinephrine, which are key neurotransmitters involved in motivation and alertness. Additionally, LTyrosine is a precursor for thyroid hormones T3 and T4, synthesized in the thyroid gland, and