 However, there are also a variety of plants that contain L-DOPA, the metabolic precursor of dopamine.The highest concentrations are found in the leaves and bean pods of plants of the genus "Mucuna", especially in "Mucuna pruriens" (velvet beans), which have been used as a source for L-DOPA as a drug.Another plant containing substantial amounts of L-DOPA is "Vicia faba", the plant that produces fava beans (also known as "broad beans").