N-Acetyl Cysteine (NAC)
N-acetyl cysteine (NAC) is a sulfur-containing amino acid derivative that serves as the most efficient precursor to glutathione, the body's master antioxidant. Originally developed as a pharmaceutical mucolytic agent to break down mucus in respiratory conditions, it has gained widespread use as a supplement for antioxidant support, liver protection, and detoxification.
Research Evidence
Protects the liver from toxin-induced damage
StrongReplenishes glutathione levels and supports antioxidant defense
StrongBreaks down mucus and improves respiratory symptoms
StrongSupports heavy metal detoxification
ModerateMay reduce symptoms of mood and psychiatric disorders
LimitedMay improve insulin sensitivity and metabolic markers
LimitedExpert Evidence
16 references from 3 experts
Safety & Cautions
Side Effects
- Nausea and gastrointestinal discomfort
- Diarrhea at higher doses
- Unpleasant sulfurous smell or taste
- Potential blood-thinning effects
NAC may increase bleeding risk and should be used cautiously by individuals with bleeding disorders or those taking anticoagulant medications. It is generally well-tolerated at standard doses, but long-term safety data at higher doses remains limited.
Pairs Well With