Used in the treatment of Parkinson’s disease to help manage symptoms such as tremors, stiffness, and poor muscle control. It crosses the blood-brain barrier and is converted into dopamine, a neurotransmitter that is deficient in Parkinson’s patients. Often combined with carbidopa or benserazide to enhance effectiveness and reduce side effects like nausea and cardiovascular issues. Also investigated for use in nerve regeneration and melanin production research.