Glutathione with Memantine for early stage PD Dementia

Does anyone have any experience of taking Glutathione (in tablet form, patches or injections) along with Memantine (and Sinemet) for early stage PD dementia? I understand that Glutathione which is the natural counter to Glutamate in the brain is typically significantly low in people with PD and wondered if taking patches of Glutathione along with Memantine (which, as I understand it, also controls Glutamate) might result in a doubly beneficial impact or conversely whether the Glutathione might interfere with the Memantine's work?