N-Acetylcysteine (NAC)
A powerful antioxidant and mucolytic agent that supports respiratory health.
Also known as: NAC for Lungs • N-Acetyl L-Cysteine
Overview
N-Acetylcysteine (NAC) is a supplement form of the amino acid cysteine. It is a potent antioxidant and acts as a precursor to glutathione, a critical antioxidant in the body. NAC is widely used for its ability to break down mucus, making it beneficial for a variety of respiratory conditions.
Key Benefits
Mucolytic Action
Helps break down and thin mucus in the airways, making it easier to clear from the lungs.
Antioxidant Support
Boosts levels of glutathione, a major antioxidant that protects lung tissue from oxidative damage.
Reduces Inflammation
May help reduce inflammation in the airways associated with conditions like bronchitis and COPD.
Dosage & How to Take
A standard dose is 600 mg taken 2-3 times per day.
| Purpose | Dose | Notes |
|---|---|---|
| General Respiratory Support | 600-1200 mg/day | Divided into two doses. |
| Chronic Bronchitis | 1200-1800 mg/day | Under medical supervision. |
Best Time to Take
Best taken on an empty stomach for better absorption, but can be taken with food to reduce stomach upset.
With or Without Food
Optional, may reduce gastrointestinal side effects.
Forms & Bioavailability
| Form | Absorption | Best For | Notes |
|---|---|---|---|
| Capsules/Tablets | Good | General use and convenience. | Most common form. |
| Effervescent Tablets | High | Faster absorption. | Dissolves in water. |
| Inhalation (Nebulizer) | Direct to lungs | Acute respiratory conditions. | Requires prescription. |
Side Effects & Safety
Common
- Nausea
- Vomiting
- Stomach upset
Rare
- Rash
- Fever
- Drowsiness
Contraindications
- Use with caution in individuals with asthma (risk of bronchospasm).
- Avoid if you have a history of peptic ulcers.
Interactions
May cause severe hypotension.
Can reduce NAC absorption.
Scientific Research
N-acetylcysteine for chronic respiratory diseases: a systematic review and meta-analysis
NAC was effective in reducing exacerbations and improving symptoms in patients with chronic bronchitis.
Food Sources
Products With N-Acetylcysteine (NAC)
2 products in our database contain this ingredient
Frequently Asked Questions
Medical Disclaimer
This content is for educational and informational purposes only and is not intended as medical advice. Always consult with a qualified healthcare professional before starting any supplement regimen, especially if you have pre-existing health conditions or are taking medications. The statements on this page have not been evaluated by the Food and Drug Administration.