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 Frontiers Emerging Evidence Highlighting the Importance of Redox Dysregulation in the Pathogenesis of Amyotrophic Lateral Sclerosis (ALS) Headaches suck. There are many reasons why one gets headaches. Some reasons: Low serotonin, high histamine, low glutathione, low folate, high oxidative stress, high aldehydes, low biopterin Dehydration is a major cause Tylenol. I couldn't handle the pain from hernia surgery so took some extra strength Tylenol x 2 a few times. Not my first choice but don't have a choice here. It's that