N-Acetyl Cysteine for Oxidative Stress & Neuroinflammation
B Good Evidence At least one randomized trial supports this, with mostly consistent results.As a glutathione precursor, NAC provides potent antioxidant and anti-inflammatory neuroprotection. Combined with selenium, research suggests synergistic protection against oxidative brain injury.
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B
The Bottom Line
As a glutathione precursor, NAC provides potent antioxidant and anti-inflammatory neuroprotection. Combined with selenium, research suggests synergistic protection against oxidative brain injury.
Key Study Findings
Other
Executive Summary of the Vulvodynia Therapeutic Research Summit.
Dose: None
vs: None
Outcome: None
Effect: None
None
Population: expert consensus on therapeutics for provoked vestibulodynia
In Vitro
Neuroinflammation-Modulating Properties Combining Glutathione, N-Acetylcysteine, and Uridine Monophosphate in a Formulation Supplement: An In Vitro …
Dose: None
vs: ALA-based formula (SUPERALA CARNITINE)
Outcome: Neuroprotective and anti-inflammatory effects
Effect: None
None
Population: 3D in vitro gut-peripheral nerve axis model
Review
Combination Supplement Therapy: A New Frontier in Treatment of Neurodegenerative Diseases.
Dose: None
vs: None
Outcome: Neurodegenerative disease pathology attenuation
Effect: None
None
Population: Preclinical neurodegenerative disease models
Systematic Review
Edible and Medicinal Fungi as Candidate Natural Antidepressants: Mechanisms and Nutritional Implications.
Dose: None
vs: None
Outcome: Antidepressant effects (neurotransmitter modulation)
Effect: None
None
Population: Preclinical models
Review
Noise exposure-induced the cerebral alterations: From emerging evidence to antioxidant-mediated prevention and treatment.
Dose: None
vs: None
Outcome: Inflammatory markers
Effect: None
None
Population: Depression patients
Review
Underlying Mechanisms of Brain Aging and Neurodegenerative Diseases as Potential Targets for Preventive or Therapeutic …
Dose: Various phytochemicals
vs: None
Outcome: Neuroprotection in aging and neurodegeneration
Effect: None
None
Population: Aging brain and NDD models (review)
Key Statistics
12
Studies
800
Participants
↑
Positive
B
Grade
Referenced Papers
Obstetrics and gynecology
2026
Edible and Medicinal Fungi as Candidate Natural Antidepressants: Mechanisms and Nutritional Implications.
Systematic Review
Molecular nutrition & …
2025
8 citations
Brain sciences
2025
The Journal of …
2025
Ecotoxicology and environmental …
2024
7 citations
Nutrients
2023
31 citations
The journal of …
2021
41 citations
Journal of fungi …
2021
14 citations
Sleep medicine clinics
2021
14 citations
Biomolecules
2020
28 citations
Neuroscience and biobehavioral …
2019
45 citations
N-acetyl-l-cysteine attenuates oxidative damage and neurodegeneration in rat brain during aging.
Other
Canadian journal of …
2018
37 citations
Medical hypotheses
2014
36 citations
Restless legs syndrome.
Review
Handbook of clinical …
2011
8 citations
Brain research. Molecular …
2005
160 citations
Dosage & Usage
mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units
Commonly Used Dosages
- general:
- 600-1,800 mg/day
- neuroprotection:
- 1,200-2,400 mg/day
Upper limit: Not established as supplement; 6,000+ mg/day used clinically (IV)
Dosages Studied in Research
| Dosage | Duration | Effect | N |
|---|---|---|---|
| None | -- | Neutral | -- |
| None | -- | Positive | -- |
| None | -- | Positive | -- |
| None | -- | Positive | -- |
| None | -- | Positive | -- |
| Various phytochemicals | -- | Positive | -- |
| None | -- | Positive | -- |
| None | -- | Positive | -- |
Best taken: On empty stomach; split into 2-3 doses; supplement zinc if using long-term
Safety & Side Effects
Reported Side Effects
- ⚠ Nausea and vomiting
- ⚠ Diarrhea
- ⚠ Unpleasant sulfur taste/smell
- ⚠ Rare: bronchospasm (inhaled form)
- ⚠ Long-term use may deplete zinc stores
Known Interactions
- ● Nitroglycerin (may enhance hypotensive effects)
- ● Activated charcoal (reduces NAC absorption)
- ● Anticoagulants (theoretical interaction)
Tolerable upper intake: Not established as supplement; 6,000+ mg/day used clinically (IV)
Always consult your healthcare provider before starting any supplement.
Frequently Asked Questions
Does N-Acetyl Cysteine help with Oxidative Stress & Neuroinflammation?
Based on 12 studies with 800 participants, there is moderate evidence from clinical studies that N-Acetyl Cysteine may support Oxidative Stress & Neuroinflammation management. Our evidence grade is B (Good Evidence).
How much N-Acetyl Cysteine should I take for Oxidative Stress & Neuroinflammation?
Studies have used various dosages. A commonly studied range is 600-1,800 mg/day. Always consult your healthcare provider before starting any supplement regimen.
Are there side effects of N-Acetyl Cysteine?
Reported side effects may include Nausea and vomiting, Diarrhea, Unpleasant sulfur taste/smell, Rare: bronchospasm (inhaled form). Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
How strong is the evidence for N-Acetyl Cysteine and Oxidative Stress & Neuroinflammation?
We rate the evidence as Grade B (Good Evidence). This rating is based on 12 peer-reviewed studies with 800 total participants. The overall direction of effect is positive.
Related Evidence
Other ingredients for Oxidative Stress & Neuroinflammation
N-Acetyl Cysteine for other conditions
References
- [1] Jill M Krapf et al.. Obstet Gynecol. 2026. Executive Summary of the Vulvodynia Therapeutic Research Summit. doi:10.1097/AOG.0000000000006118 PubMed
- [2] Pin Gong et al.. Mol Nutr Food Res. 2025. Edible and Medicinal Fungi as Candidate Natural Antidepressants: Mechanisms and Nutritional Implications. doi:10.1002/mnfr.70080 PubMed
- [3] Simone Mulè et al.. Brain Sci. 2025. Neuroinflammation-Modulating Properties Combining Glutathione, N-Acetylcysteine, and Uridine Monophosphate in a Formulation Supplement: An In Vitro Study. doi:10.3390/brainsci15121340 PubMed
- [4] Alexander Shtilbans. J Nutr. 2025. Combination Supplement Therapy: A New Frontier in Treatment of Neurodegenerative Diseases. doi:10.1016/j.tjnut.2025.07.004 PubMed
- [5] Yuyan Chen et al.. Ecotoxicol Environ Saf. 2024. Noise exposure-induced the cerebral alterations: From emerging evidence to antioxidant-mediated prevention and treatment. doi:10.1016/j.ecoenv.2024.117411 PubMed
- [6] Hamid Mostafavi Abdolmaleky et al.. Nutrients. 2023. Underlying Mechanisms of Brain Aging and Neurodegenerative Diseases as Potential Targets for Preventive or Therapeutic Strategies Using Phytochemicals. doi:10.3390/nu15153456 PubMed
- [7] Jonathan Paulo Agnes et al.. J Pain. 2021. Antioxidants Improve Oxaliplatin-Induced Peripheral Neuropathy in Tumor-Bearing Mice Model: Role of Spinal Cord Oxidative Stress and Inflammation. doi:10.1016/j.jpain.2021.03.142 PubMed
- [8] Mihai-Vlad Valu et al.. J Fungi (Basel). 2021. Hericium erinaceus (Bull.) Pers. Ethanolic Extract with Antioxidant Properties on Scopolamine-Induced Memory Deficits in a Zebrafish Model of Cognitive Impairment. doi:10.3390/jof7060477 PubMed
- [9] Sergi Ferré et al.. Sleep Med Clin. 2021. Akathisia and Restless Legs Syndrome: Solving the Dopaminergic Paradox. doi:10.1016/j.jsmc.2021.02.012 PubMed
- [10] Mujtaba Aamir Bhat et al.. Biomolecules. 2020. Expedition into Taurine Biology: Structural Insights and Therapeutic Perspective of Taurine in Neurodegenerative Diseases. doi:10.3390/biom10060863 PubMed
- [11] Marc J Kaufman et al.. Neurosci Biobehav Rev. 2019. Supraphysiologic-dose anabolic-androgenic steroid use: A risk factor for dementia? doi:10.1016/j.neubiorev.2019.02.014 PubMed
- [12] Geetika Garg et al.. Can J Physiol Pharmacol. 2018. N-acetyl-l-cysteine attenuates oxidative damage and neurodegeneration in rat brain during aging. doi:10.1139/cjpp-2018-0209 PubMed
- [13] Alan D Strickland. Med Hypotheses. 2014. Prevention of cerebral palsy, autism spectrum disorder, and attention deficit-hyperactivity disorder. doi:10.1016/j.mehy.2014.02.003 PubMed
- [14] Lynn Marie Trotti et al.. Handb Clin Neurol. 2011. Restless legs syndrome. doi:10.1016/B978-0-444-52014-2.00047-1 PubMed
- [15] Birgit M Dietz et al.. Brain Res Mol Brain Res. 2005. Valerian extract and valerenic acid are partial agonists of the 5-HT5a receptor in vitro. doi:10.1016/j.molbrainres.2005.04.009 PubMed
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.