Dr. Stephen Lynch, President of Medical Staff, Phoenix City of Hope JAMES LYNCH, MD Stellate Ganglion Block (SGB) for Anxiety and PTSD NAC is an effective, inexpensive supplement. The key is to know why to use itand when. It's also key to know when to stop. Taking too much of anything isn't good. Take NAC is a great supplement. It's awesome stuff to support healthy lungs. NAC is a known mucolytic. That is a fancy term meaning breaking up mucus. Now, research does show that NAC David J. Lynch, MD Mullica Hill, NJ General Surgery, Phlebology, Venous and Lymphatic Medicine Request Appointment