L-DOPA is a medication commonly used to treat symptoms of Parkinson's disease. It is a precursor to dopamine, a neurotransmitter that plays a key role in movement and other functions in the brain. L-DOPA is typically administered in combination with other medications to manage symptoms such as tremors, stiffness, and slowness of movement. Research in this area focuses on improving the effectiveness and longevity of L-DOPA treatment, finding new ways to deliver the medication, and understanding its impact on brain function and neurodegeneration in Parkinson's disease.