N-Acetyl Cysteine (NAC) is a supplemental form of the amino acid L-cysteine that serves as a precursor to glutathione, one of the body's most important antioxidants. Research suggests NAC supports multiple areas of health, with studies indicating benefits for liver function, respiratory health through its ability to thin mucus, and immune system resilience. Its role in replenishing glutathione has made it a subject of investigation for detoxification support, and emerging research has explored its potential in areas such as fertility and mental health, including obsessive-compulsive symptoms, likely through its influence on oxidative stress and neurotransmitter pathways. Long used in clinical settings to support liver health during acute acetaminophen toxicity, NAC continues to attract scientific interest as a versatile and well-studied compound with a broad range of potential applications.
Compare this supplementResearch suggests that NAC may support antioxidant defenses through several overlapping mechanisms, with the most dir...
View studies →Research suggests that NAC may serve a detoxification role primarily by neutralizing reactive oxygen species, directl...
View studies →Research suggests that NAC may support immune function primarily through its antioxidant and anti-inflammatory proper...
View studies →The studies provided do not contain research on N-Acetyl Cysteine (NAC) or its effects on liver health. The linked st...
View studies →Research suggests that N-acetyl cysteine (NAC) may play a supportive role in respiratory health, particularly in the ...
View studies →The three studies provided do not contain any research on N-Acetyl Cysteine (NAC) or fertility support. The linked st...
View studies →These are commonly referenced dosage ranges for this supplement. They are not medical recommendations. Always consult a healthcare provider before supplementing.
| Form | Dose range | Frequency | Studied for | Source |
|---|---|---|---|---|
| Capsule | 600–1,200 mg | Twice daily | Fertility support, including PCOS and sperm quality | Common in fertility-focused RCTs for male and female reproductive outcomes |
| Capsule | 600 mg | Daily | General antioxidant support and liver health | Common dose in clinical trials for oxidative stress and hepatoprotection |
| Capsule | 600–1,200 mg | Daily | Immune function and glutathione replenishment | Commonly studied range for immune modulation and intracellular glutathione support |
| Capsule | 2,400–3,000 mg | Daily | OCD support and psychiatric symptom reduction | Used in RCTs for OCD and mood disorders; divided doses across the day |
| Capsule | 1,200–1,800 mg | Daily | Respiratory health, including chronic bronchitis and COPD | Based on RCTs; 600mg twice or three times daily used in respiratory studies |
| Powder | 4,000–8,000 mg | Daily | Detoxification and acetaminophen overdose management (medical setting) | High-dose oral NAC used clinically for hepatotoxicity; not for self-supplementation |