N-Acetyl Cysteine for Post-Concussion Cognitive Symptoms
BNAC demonstrated neuroprotective effects in traumatic brain injury models. MRI studies showed improvements in resting-state brain connectivity in mild TBI patients receiving NAC treatment.
The Bottom Line
NAC demonstrated neuroprotective effects in traumatic brain injury models. MRI studies showed improvements in resting-state brain connectivity in mild TBI patients receiving NAC treatment.
Key Study Findings
Population: patients with chronic post-concussion syndrome for at least 3 months
Population: Individuals with or at risk for TBI
Population: Elderly patients (>=60y) with mild TBI
Population: restless legs syndrome
Population: None
Population: Athletes
Key Statistics
6
Studies
400
Participants
Positive
Grade
Referenced Papers
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 | -- | Positive | 50 |
| None | -- | Positive | -- |
| None | 4 weeks | Positive | 65 |
| None | -- | Mixed | -- |
| None | -- | Positive | -- |
| None | -- | Mixed | -- |
| NAC 100 mg/kg body weight orally daily for 14 days | 2 weeks | Positive | 24 |
| None | -- | Mixed | -- |
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 Post-Concussion Cognitive Symptoms?
How much N-Acetyl Cysteine should I take for Post-Concussion Cognitive Symptoms?
Are there side effects of N-Acetyl Cysteine?
How strong is the evidence for N-Acetyl Cysteine and Post-Concussion Cognitive Symptoms?
Related Evidence
N-Acetyl Cysteine for other conditions
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.