... the precursors during the Invivo synthesis of noradrenalin, dopamine, and so on. It can increase the level ofdopamine in cerebral tissue ... . Parkinsonism is caused by the lack of dopamine incerebral tissue, so this product can be used in the clinical treatment of ... alleviate the symptom (outsourced dopamine cannot pass Blood-Brain Barrier,so it cannot be used directly). It is also effective upon ...