The velvet bean (Mucuna pruriens) belongs to Fabaceae (the Pea family). It is an annual woody vine that is probably native to the Himalayas, and nowadays cultivated in Africa, India and the Caribbean Basin. It was also introduced into Japan before 17th century. This herb is a climbing vine that can reach over 15 m in length. The leaves are trifoliate with ovate or obovate leaflets. The white, lavender, or purple papilionacenous flowers bloom in the axially panicles, 15 to 30 cm long in summer. The fruits are legumes, about 10 cm long, and carry up to seven seeds. In many parts of the world, it is used as an important forage, fallow and green manure crop. This herb contains L-DOPA, a precursor to the neurotransmitter dopamine. Dopamine is an important brain chemical involved in mood, sexuality, and movement.