NAC is a natural bottleneck precursor in the cellular production of glutathione, which is often called the “master antioxidant.” A glutathione deficiency in the substantia nigra region of the brain is common in Parkinson’s patients. Having recently demonstrated the ability to increase dopamine binding by 9% and improve UPDRS score results by 13% in preliminary clinical trials, NAC is an important component of Restore Gold™ (Monti 2016).