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N-Acetyl Cysteine

What does the research say about N-Acetyl Cysteine?

2 health outcomes synthesised

Research on N-Acetyl Cysteine (NAC) spans 2 health outcomes, with the strongest body of evidence supporting its role in reducing mortality risk. Across 4 studies, NAC showed a large beneficial effect on mortality reduction, particularly in patients with COVID-19 and rodenticide poisoning, though the evidence base is small and preliminary. No consistent effective dose was identified for mortality outcomes due to variability across studies.

Strongest evidence The most robust finding for N-Acetyl Cysteine is a moderate-strength association with reduced mortality risk. In a synthesis of 4 studies, 3 reported beneficial effects with large effect sizes. A meta-analysis in COVID-19 found a 41% risk reduction (RR=0.59), and studies in rodenticide poisoning reported odds ratios of 0.25–0.34. One null trial in infants with esophageal atresia did not show benefit. An effective dose for mortality reduction could not be determined from available data.

Mixed or weaker evidence Evidence for increasing platelet count is low-strength. Of 4 studies, 2 showed benefit (large and moderate effects) in critically ill adults on linezolid and in hematopoietic stem cell transplant patients, while 2 found neutral effects in immune thrombocytopenia and thrombotic thrombocytopenic purpura. The overall direction suggests context-dependent benefit, with only 2 of 4 studies reaching statistical significance.

Effective dose patterns For platelet count outcomes, the most-studied dose is 600 mg every 12 hours, with a range of 400–600 mg every 8–12 hours. No consistent dose emerged for mortality outcomes.

Population insights Beneficial mortality effects were observed in patients with COVID-19, rodenticide poisoning, and non-acetaminophen acute liver injury. Platelet benefits were limited to specific clinical scenarios (linezolid-treated patients and HSCT conditioning). Generalizability to broader populations remains uncertain.

Notable caveats

  • Publication bias likely inflates the positive findings for mortality reduction, as null results are less likely to be published.
  • Both evidence bases are small (4 studies each), making conclusions preliminary.
  • One mortality study used nebulized NAC in infants — this route and population may not generalize.
  • Two of 4 platelet studies did not reach significance, suggesting the true effect may be smaller or null in many contexts.

Frequently asked

  • What is N-Acetyl Cysteine good for according to research?
    Research suggests NAC may reduce mortality risk in conditions such as COVID-19 and rodenticide poisoning, based on 3 of 4 studies showing beneficial effects with large effect sizes. It may also increase platelet counts in specific clinical settings, such as critically ill adults receiving linezolid or patients undergoing stem cell transplant, though evidence is weaker and mixed.
  • What dose of N-Acetyl Cysteine is typically used in studies?
    For platelet-related outcomes, studies most commonly used 600 mg every 12 hours, with a range of 400–600 mg every 8–12 hours. For mortality reduction, doses varied widely and were inconsistently reported, so no specific effective dose could be identified from the available research.
  • Who benefits most from N-Acetyl Cysteine?
    For mortality reduction, patients with COVID-19 and rodenticide poisoning showed the most benefit in studies. For platelet count improvement, benefits were seen in critically ill adults on linezolid and in patients with myeloid malignancies undergoing hematopoietic stem cell transplant. Generalizability to other populations is uncertain.
  • Are there caveats or limitations in the research on N-Acetyl Cysteine?
    Yes. Both evidence syntheses are based on only 4 studies each, so conclusions are preliminary. Publication bias is a concern for mortality outcomes, as null-result studies may be underrepresented. Many platelet studies did not reach statistical significance, suggesting the effect may be smaller or context-dependent. One mortality study used nebulized NAC in infants, which may not generalize to adults or other routes.
  • Does N-Acetyl Cysteine help with reducing mortality risk?
    The evidence is moderate-strength and positive overall. Three of 4 studies reported reduced mortality, with large effect sizes in COVID-19 (41% risk reduction) and rodenticide poisoning (OR 0.25–0.34). However, one study in infants found no effect, and the evidence base is small and may be affected by publication bias.
  • Does N-Acetyl Cysteine increase platelet count?
    Evidence is low-strength and mixed. Two of 4 studies found beneficial effects in specific populations (linezolid-treated critically ill adults and HSCT patients), but 2 other studies found no benefit in immune thrombocytopenia and thrombotic thrombocytopenic purpura. The effect appears context-dependent and may not apply broadly.

Most-studied combinations with N-Acetyl Cysteine

most supplement research is combination research
Also studied with:Glutathione (2), L-Carnitine (4), Vitamin E (4), Vitamin C (2)

  • NAC

    By Amazing Nutrition

    4.6 (370 reviews)
    In Stock
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    Amazon
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    iHerb
    $21.99
    		In
    Vitacost
    $20.19
    		In
    Vitamin Shoppe
    $-
    		Out

  • Fundamentals, NAC, N-Acetyl-L-Cysteine, 600 mg

    By Force Factor

    4.7 (5.9K reviews)
    Out of Stock
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    Amazon
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    iHerb
    $21.49
    		In
    Vitacost
    $21.49
    		In
    Vitamin Shoppe
    $39.99
    		In

  • Don Colbert M.D. Liver Gallbladder Cleanse

    By Divine Health

    5 (3 reviews)
    In Stock
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    iHerb
    $19.79
    		In
    Vitacost
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    Vitamin Shoppe
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  • NAC Detox Regulators

    By Doctor's Best

    4.8 (20.6K reviews)
    Out of Stock
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    Amazon
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    iHerb
    $21.95
    		In
    Vitacost
    $23.59
    		In
    Vitamin Shoppe
    $-
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  • Multi Vitamin

    By Revive

    4.8 (5 reviews)
    In Stock
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    Amazon
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    iHerb
    $44.99
    		In
    Vitacost
    $-
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    Vitamin Shoppe
    $31.49
    		In

  • Anti-Alcohol Complex

    By Life Extension

    4.7 (2.1K reviews)
    Out of Stock
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    Amazon
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    iHerb
    $16.50
    		In
    Vitacost
    $16.49
    		In
    Vitamin Shoppe
    $18.15
    		In

  • NAC+

    By Kal

    4.8 (324 reviews)
    In Stock
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