N-Acetyl Cysteine

Also indexed as: Acetyl Cysteine, NAC
N-Acetyl Cysteine: Main Image

NAC (N-acetyl cysteine) is an altered form of the amino acid cysteine, which is commonly found in food and synthesised by the body.

  • Reliable and relatively consistent scientific data showing a substantial health benefit.
  • Contradictory, insufficient, or preliminary studies suggesting a health benefit or minimal health benefit.
  • For an herb, supported by traditional use but minimal or no scientific evidence. For a supplement, little scientific support.

Our proprietary “Star-Rating” system was developed to help you easily understand the amount of scientific support behind each supplement in relation to a specific health condition. While there is no way to predict whether a vitamin, mineral, or herb will successfully treat or prevent associated health conditions, our unique ratings tell you how well these supplements are understood by the medical community, and whether studies have found them to be effective for other people.

For over a decade, our team has combed through thousands of research articles published in reputable journals. To help you make educated decisions, and to better understand controversial or confusing supplements, our medical experts have digested the science into these three easy-to-follow ratings. We hope this provides you with a helpful resource to make informed decisions towards your health and well-being.

This supplement has been used in connection with the following health conditions:

Used for AmountWhy
Bronchitis400 to 600 mg daily3 stars[3 stars] NAC, which appears to work by reducing the thickness of mucus, has been shown to be a safe and effective treatment for chronic bronchitis.
Chronic Obstructive Pulmonary Disease200 mg three times daily3 stars[3 stars] N-acetyl cysteine helps break down mucus and supplies anti-oxidant protection to lung tissue.
Angina600 mg three times daily (under medical supervision if taking nitroglycerine)2 stars[2 stars] Under a doctor’s supervision, supplementing with NAC may improve the effects of nitroglycerine.
Gastritis1 gram daily 2 stars[2 stars] In one study, people with atrophic gastritis given NAC saw increased healing.
Heart AttackConsult a qualified doctor2 stars[2 stars] In one study, NAC injections decreased the amount of tissue damage in people who had suffered a heart attack.
HIV and AIDS Support800 mg daily 2 stars[2 stars] Supplementing with NAC may slow the decline in immune function.

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The information presented in Aisle7 is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires June 2011.