N-Acetyl-L-Cysteine offers support for:

  • Antioxidant Support‡
  • Respiratory Support‡

$32.00 or Original price was: $32.00.Current price is: $28.80. / month

(Subscriptions can be managed in your account and cancelled at any time without penalty.)

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N-Acetyl-L-Cysteine (NAC) contains 750 mg of NAC, which is an altered form of the amino acid L-cysteine, per capsule. NAC enhances glutathione production and has been shown to support healthy lung function.‡

A review of 39 clinical trials of N-Acetyl-L-Cysteine found that 400 to 600 mg per day was a safe and effective treatment for chronic bronchitis. NAC supplementation was found to reduce the number of aggravations of the illness in almost 50% of people taking the supplement, compared with only 31% of those taking placebo.  Smokers have also been found to benefit from taking NAC.‡

In addition to helping break up mucus, NAC may reduce the elevated bacterial counts that are often seen in the lungs of smokers with chronic bronchitis.  In another double-blind study, people with chronic bronchitis who took NAC showed an improved ability to expectorate and a reduction in cough severity.  These benefits may result from NAC’s capacity to reduce the viscosity (thickness) of sputum.‡



Warning:  If you are pregnant or lactating woman, have any health conditions, or are taking any medication, make sure to consult your healthcare provider prior to use.

‡ These statements have not been evaluated by the Food and Drug Administration.
These products are not intended to diagnose, treat, cure or prevent any disease.



One vegetable capsule per serving, up to four capsules per day


120 Vegetable Capsules


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Aremu DA, Madejczyk MS, Ballatori N. N-acetylcysteine as a potential antidote and biomonitoring agent of methylmercury exposure. Environ Health Perspect. 2008 Jan;116(1):26-31. doi: 10.1289/ehp.10383. PMID: 18197295; PMCID: PMC2199271.

Mokhtari V, Afsharian P, Shahhoseini M, Kalantar SM, Moini A. A Review on Various Uses of N-Acetyl Cysteine. Cell J. 2017 Apr-Jun;19(1):11-17. doi: 10.22074/cellj.2016.4872. Epub 2016 Dec 21. PMID: 28367412; PMCID: PMC5241507.

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Pirabbasi E, Shahar S, Manaf ZA, Rajab NF, Manap RA. Efficacy of Ascorbic Acid (Vitamin C) and/N-Acetylcysteine (NAC) Supplementation on Nutritional and Antioxidant Status of Male Chronic Obstructive Pulmonary Disease (COPD) Patients. J Nutr Sci Vitaminol (Tokyo). 2016;62(1):54-61. doi: 10.3177/jnsv.62.54. PMID: 27117852.

Dekhuijzen PN, van Beurden WJ. The role for N-acetylcysteine in the management of COPD. Int J Chron Obstruct Pulmon Dis. 2006;1(2):99-106. doi: 10.2147/copd.2006.1.2.99. PMID: 18046886; PMCID: PMC2706612.

Dekhuijzen PN. Antioxidant properties of N-acetylcysteine: their relevance in relation to chronic obstructive pulmonary disease. Eur Respir J. 2004 Apr;23(4):629-36. doi: 10.1183/09031936.04.00016804. PMID: 15083766.

Santus P, Corsico A, Solidoro P, Braido F, Di Marco F, Scichilone N. Oxidative stress and respiratory system: pharmacological and clinical reappraisal of N-acetylcysteine. COPD. 2014 Dec;11(6):705-17. doi: 10.3109/15412555.2014.898040. Epub 2014 Apr 30. PMID: 24787454; PMCID: PMC4245155.