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N-Acetylcysteine (NAC)

Antioxidant support, mucolytic agent, acetaminophen overdose antidote

Evidence · Grade BSafety · Generally safe
Traditional useInteraction risk

N-Acetylcysteine (NAC) is a cysteine derivative and glutathione precursor known for its antioxidant and mucolytic properties, with established uses in acetaminophen overdose and potential benefits for respiratory and mental health.

Last reviewed June 17, 2026 · AI-assisted, human-reviewed
N-Acetylcysteine (NAC) is a derivative of the amino acid L-cysteine. It is a precursor to glutathione, a powerful antioxidant in the body. NAC is widely recognized for its mucolytic properties, meaning it can help thin mucus, and is used clinically as an antidote for acetaminophen overdose. Beyond its established uses, NAC is being investigated for its potential role in various conditions due to its antioxidant, anti-inflammatory, and neuroprotective effects. It may help support respiratory health, liver function, and mental well-being, though more research is needed to confirm many of these applications. NAC is available as an oral supplement and is also administered intravenously in medical settings for specific conditions.

Quick answer

What it is: N-Acetylcysteine (NAC) is a derivative of the amino acid L-cysteine.

May support:Viral Infections, Anxiety, Common Cold/Flu, Chronic Bronchitis, Bipolar Disorder, OCD, Non-Alcoholic Fatty Liver Disease (NAFLD), Asthma, Non-Alcoholic Fatty Liver Disease (NAFLD), Liver Disease, COPD, Depression

Evidence:Evidence · Grade B

Safety:Safety · Generally safe

Evidence Summary

Evidence · Grade B

NAC has strong evidence for its use as an antidote for acetaminophen overdose and as a mucolytic agent in certain respiratory conditions. For other applications, such as antioxidant support, mental health, and liver support, there is a growing body of research, including numerous clinical trials, suggesting potential benefits. However, the evidence for these broader applications is often from smaller studies or requires further large-scale confirmation.

Last reviewed · Jun 2026

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Why It Works

NAC acts as a precursor to glutathione, enhancing the body's antioxidant defenses. It also directly scavenges free radicals and helps break down disulfide bonds in mucus, reducing its viscosity.

How it works in more detail

N-Acetylcysteine (NAC) primarily exerts its effects through several mechanisms. Firstly, it serves as a direct precursor to L-cysteine, which is a rate-limiting substrate for the synthesis of glutathione (GSH). GSH is a critical endogenous antioxidant that protects cells from oxidative damage. By increasing GSH levels, NAC enhances the body's antioxidant capacity. Secondly, NAC itself possesses direct antioxidant properties, capable of scavenging reactive oxygen species. Thirdly, NAC has mucolytic activity; it works by cleaving disulfide bonds in mucoproteins, thereby reducing the viscosity of mucus secretions, which is beneficial in respiratory conditions. Additionally, NAC may modulate inflammatory pathways and neurotransmitter systems, contributing to its potential therapeutic effects in various neurological and psychiatric conditions.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
Common oral dosages for general wellness or antioxidant support range from 600 mg to 1200 mg per day, often divided into two doses. It is typically available in capsule or tablet form.
Research dosage range
Dosages in research vary widely depending on the condition, ranging from 600 mg to 1800 mg orally per day for antioxidant or respiratory support, and much higher doses (e.g., 150 mg/kg followed by 50-100 mg/kg) in clinical settings for acetaminophen overdose.
Typical onset
Effects may vary; mucolytic effects can be observed within hours, while antioxidant or mood-related benefits may take weeks to months of consistent use.
Typical forms
capsule, tablet, powder, effervescent tablet
Quality markers
Look for products from reputable manufacturers that provide third-party testing for purity and potency. Ensure the product specifies N-Acetylcysteine as the active ingredient.
Medication interactions
  • Nitroglycerin
  • Activated Charcoal
  • Immunosuppressants
  • Anticoagulants / Antiplatelets
Avoid if
  • Asthma (inhaled forms)
  • Bleeding disorders
  • Known allergy to NAC
Pregnancy / lactation
Limited data are available on the safety of NAC during pregnancy and lactation. While it is used in life-threatening acetaminophen overdose during pregnancy, routine supplementation is generally not recommended without medical supervision. Consult a healthcare professional before use if pregnant or breastfeeding.

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Suggested dosage

Common oral dosages for general wellness or antioxidant support range from 600 mg to 1200 mg per day, often divided into two doses. It is typically available in capsule or tablet form.

General guidance — discuss specifics with a clinician.

Active medicinal compounds

N-Acetylcysteine

Traditional use

NAC is a synthetic compound and does not have a history of traditional use in herbal medicine systems.

Safety

Safety warnings

NAC is generally considered safe for short-term use. High doses may cause gastrointestinal upset, including nausea, vomiting, and diarrhea. Inhaled NAC can cause bronchospasm in individuals with asthma. Allergic reactions, though rare, can occur. Individuals with bleeding disorders or those undergoing surgery should use with caution due to potential effects on platelet aggregation.

Avoid if

  • Asthma (inhaled forms)
  • Bleeding disorders
  • Known allergy to NAC

Medication interactions

  • Nitroglycerin
  • Activated Charcoal
  • Immunosuppressants
  • Anticoagulants / Antiplatelets

Reported side effects

  • Nausea
  • Vomiting
  • Diarrhea
  • Stomach upset
  • Heartburn
  • Skin rash
  • Bronchospasm (inhaled)

Pregnancy & lactation

Limited data are available on the safety of NAC during pregnancy and lactation. While it is used in life-threatening acetaminophen overdose during pregnancy, routine supplementation is generally not recommended without medical supervision. Consult a healthcare professional before use if pregnant or breastfeeding.

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

No indexed evidence yet. We're still building out this remedy's evidence ecosystem.

Limitations: Many studies on NAC for conditions other than acetaminophen overdose are preliminary, have small sample sizes, or show inconsistent results. Optimal dosages and long-term effects for various conditions are not fully established. Research often uses different forms and routes of administration, making direct comparisons difficult.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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