Also known as L-3,4-dihydroxyphenylalanine, L-DOPA is a chemical used in many functions of the human body (as well as in some plants and animals too). It is best known as the direct precursor to the neurotransmitter dopamine. Here are the amino acid precursors, L-Phenylalanine and L-Tyrosine, … [Read more...] about L-DOPA