NAC (N-Acetyl Cysteine)
amino acids
NAC is a precursor to glutathione, a powerful antioxidant that supports liver detoxification and respiratory health. It has been used clinically for decades to treat acetaminophen overdose and is increasingly researched for its mucolytic and neuroprotective properties. Evidence supports its use for several health conditions, particularly those involving oxidative stress.
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Benefits
Dosage
Typical Dose
600-1200 mg daily in divided doses
Upper Limit
2000-2400 mg daily (consult healthcare provider)
Timing
With or without food; twice daily dosing commonly used
Forms & Bioavailability
Powder
High bioavailability; most flexible dosing option
Capsule
Good bioavailability; convenient and standardised dosing
Tablet
Good bioavailability; stable and easy to transport
Side Effects
Interactions
Research Summary
Substantial clinical evidence supports NAC's use for acetaminophen toxicity, chronic obstructive pulmonary disease, and mucolytic effects. Research indicates benefits for liver function, mental health conditions including OCD, and fertility; however, more high-quality trials are needed for some applications. Safety profile is well-established with decades of clinical use, though optimal dosing varies by condition.
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The Bottom Line on NAC (N-Acetyl Cysteine)
NAC (N-Acetyl Cysteine) is well-researched with strong evidence supporting its primary benefits.It is most commonly used for supports glutathione production and antioxidant defence and promotes liver detoxification and hepatic health. As with any supplement, individual results vary. Start with the lower end of the dosage range and assess for 4-8 weeks before adjusting.
About Our Research
This profile is compiled from peer-reviewed research published on PubMed, the NIH Office of Dietary Supplements, and established nutritional science databases. Dosages reflect clinically-studied amounts from human trials where available. We update profiles as new research emerges. This is not medical advice — consult a healthcare professional before supplementing.
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Goal Guides for NAC (N-Acetyl Cysteine)
See how NAC (N-Acetyl Cysteine) can help with specific health goals: