Dopamine is a neurotransmitter that promotes enjoyment and interest in life. L-DOPA, found in Mucuna Pruriens, can boost your brain's dopamine levels. Dopamine is a key inhibitor of prolactin. Increasing dopamine and simultaneously reducing prolactin can increase libido, mood, and overall sense of well being. When taken prior to bed, users report improved sleep quality from L-DOPA supplementation.