L-dopa and its combination with pyridoxal 5'-phosphate.
D055598:Chemical Phenomena; D002621:Chemistry; D004295:Dihydroxyphenylalanine / Q000378:metabolism; D004355:Drug Stability; D006801:Humans; D011732:Pyridoxal Phosphate / Q000378:metabolism; D012867:Skin / Q000201:enzymology
D011732:Pyridoxal Phosphate; D004295:Dihydroxyphenylalanine