N-Acetyl Cysteine
Rate-limiting precursor to glutathione, the body's master antioxidant — supports mood, respiratory health, and liver protection.
N-Acetyl Cysteine (NAC) is the supplemental form of the amino acid cysteine and the rate-limiting precursor to glutathione, the body's master antioxidant. Research supports its use for mood disorders, respiratory health, liver protection, and oxidative stress reduction.
Replenishes the body's master antioxidant
Regulates excitatory neurotransmission
Breaks down mucus in airways
How NAC works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
600-1800mg daily
Can be taken without food
| Form | Type |
|---|---|
| 💊NAC capsules or powder | Recommended |
| 💊Effervescent tablets | Alternative |
| 💊Sustained-release | Alternative |
Standard NAC is well-absorbed. Sustained-release may reduce GI issues. Some use with vitamin C to prevent oxidation.
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Best absorbed on empty stomach, but can cause nausea. If GI issues occur, take with light meal. Split doses for higher amounts.
Reduced symptoms of depression
Enhanced glutathione levels and protection
Reduced mucus and easier breathing
Can cause nausea if not taken properly
Used clinically for acetaminophen overdose in pregnancy; supplements less studied
Use caution; may cause bronchospasm in some individuals
May enhance vasodilatory effects; can cause severe headache
May have mild antiplatelet effects — may affect platelet aggregation or vitamin K-dependent clotting factors, altering anticoagulant efficacy
May reduce NAC absorption
Tip: Take with food; reduce dose
Tip: Normal; can use capsules instead of powder
Tip: Reduce dose
Vitamin C helps regenerate glutathione
Enhanced antioxidant recycling
Both support mood through different mechanisms
Comprehensive mood and antioxidant support
Both support glutathione and liver health
Comprehensive liver support and detoxification
Both thin mucus through different mechanisms
Comprehensive respiratory mucus support
NAC supports glutathione; TUDCA reduces ER stress
Multi-pathway liver protection
Top studies from 38+ peer-reviewed papers
Viña I et al. • Nutrients (2025)
“NAC had a major effect on progesterone, endometrial thickness, and LH levels in women with PCOS.”
Abu Hasna A et al. • Odontology (2025)
“The Author(s), under exclusive licence to The Society of The Nippon Dental University.”
Peng TR et al. • General hospital psychiatry (2024)
“Our findings indicate that adjunctive NAC can ameliorate depressive symptoms in patients with psychiatric problems, particularly bipolar disorder.”
Winterlind EL et al. • Addiction biology (2024)
“Addiction Biology published by John Wiley & Sons Ltd on behalf of Society for the Study of Addiction.”
Sadowski M et al. • Journal of cellular and molecular medicine (2024)
“Journal of Cellular and Molecular Medicine”
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