Positives

• A patient who had been suffering for five months found that NAC helped their brain fog and fatigue enough to improve their overall level of function, and was able to isolate it as the specific supplement making a difference Reddit.
  
  
• A 49-year-old female long-hauler reported that NAC “dramatically improved my HRV in just a few weeks,” with readings jumping from a chronic range of 16–34 to significantly higher levels after starting supplementation Reddit.
  
  

Negatives

• An 18-month long-hauler who tried NAC for four months reported that “it didn’t help at all,” despite consistent use at standard doses Reddit.
  
  
• A patient reported that NAC helped significantly at first but the effects “only lasted about 2 weeks” before diminishing, suggesting the benefit may not be sustained for all patients Reddit.
  
  

Hurdles & Side Effects

• A long-hauler emphasized that standard doses under 2 grams per day may be insufficient, noting they needed 3.5–4 grams daily in powder form to see meaningful effects, and cautioning others not to rule out NAC based on small doses alone Reddit.