What it is
Regulatory status: FDA-approved drug for specific indications and also marketed in US dietary supplements under FDA enforcement discretion
Mechanism evidence: human
At a glance
What it is, why people use it, the evidence, and what to know before trying it.
Why people use it
- Glutathione support
- Mucus clearance
- Antioxidant or recovery support
Evidence at a glance
NAC has established medical uses, especially as an antidote and mucolytic, but evidence for broad oral wellness and performance claims is outcome-specific and inconsistent.
Confidence: moderate
Safety & interactions
Known side effects, interactions and use limits from reviewed sources.
Oral NAC commonly causes gastrointestinal symptoms. It can interact with nitroglycerin and may be inappropriate in some people with asthma, bleeding risk, or before procedures.
- nitroglycerin
Forms and variants
This review does not automatically apply to:
- intravenous acetylcysteine
- inhaled acetylcysteine
- cysteine
Seen in protocols
Public protocols that include N-acetylcysteine. Open one to see the full context and source.