L-Dopa鈥攁lso known as levodopa, 3-hydroxy-L-tyrosine, and dozens of other names鈥攈as been known for at least 90 years as a naturally occurring amino acid that is the biological precursor to the neurotransmitter dopamine.聽L-Dopa is administered to increase dopamine levels in Parkinson鈥檚 disease patients; unlike dopamine, it can cross the blood鈥揵rain barrier.
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