I subscribe to Dr. Whitaker's newsletter and tried the inhaled glutathione for two months now and it hasn't helped me. In fact, sometimes, it makes me cough and I get short of breath. I tried the mouth piece at first and I was hyperventalating so I switched to the face mask so I could keep my mouth shut and only use my nose. I am very disappointed as I was hoping for some relief from my shortness of breath due to my emphyzema.My Dr. told me it is the grand daddy of antioxidants. I'll keep searching.