N-Acetyl-L-Cysteine (NAC), 120 Tablets
120 Tablets
May be a fit for
- Adults seeking NAC to support glutathione synthesis and antioxidant status
- Individuals supporting respiratory mucus clearance with N-Acetyl-L-Cysteine
- Practitioners protocols requiring NAC for liver detoxification pathway support
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Allergy Research Group's N-Acetyl-L-Cysteine (NAC) delivers a stable, acetylated form of the amino acid cysteine, a direct precursor to glutathione, the body's primary endogenous antioxidant. This 120-tablet formula supports antioxidant status, respiratory tract health, and liver function, and is well-suited for practitioners and health-conscious individuals seeking targeted glutathione precursor support.
Why It's Worth Considering: Allergy Research Group formulates to practitioner-grade standards, using NAC in its well-researched acetylated form for reliable bioavailability and consistent dosing across a 120-tablet supply.
Allergy Research Group · 120 TabletsMake it part of your routine.
As a dietary supplement, 1 tablet one to three times daily, or as directed by a healthcare practitioner.
Important cautions & interactions
Product details
Supplement facts & complete label
Serving Size:
2 Tablets
Amount Per Serving:
N-Acetyl-L-Cysteine ... 1000 mg
Other Ingredients:
Dicalcium phosphate, microcrystalline cellulose, magnesium stearate, silicon dioxide, stearic acid, croscarmellose sodium.
Label directions
As a dietary supplement, 1 tablet one to three times daily, or as directed by a healthcare practitioner.
Label cautions
Keep in a cool, dry place, tightly capped.
Source: authorized supplier original manufacturer label · September 06, 2026. Formulas and labels can change. Check the packaging you receive.
Who it may suit
May be a fit for
- Adults seeking NAC to support glutathione synthesis and antioxidant status
- Individuals supporting respiratory mucus clearance with N-Acetyl-L-Cysteine
- Practitioners protocols requiring NAC for liver detoxification pathway support
- Those seeking N-Acetyl-L-Cysteine to help maintain healthy oxidative balance
Considerations
- Active bleeding or bleeding disorders
- Taking nitroglycerin (may cause hypotension)
- Asthma (rare cases of bronchospasm at high doses)
- Scheduled surgery within 1 week
What to expect over time
Glutathione Boost
Increased intracellular glutathione production
Liver Support
Enhanced phase II detoxification
Respiratory & Mental
Clearer breathing, reduced compulsive symptoms
Systemic Antioxidant
Reduced oxidative stress markers
Based on clinical NAC research at 600-1800mg/day.
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Thorne - Milk Thistle Phytosome (formerly Siliphos), 90 CapsulesNAC supports phase II liver detoxification while milk thistle (silymarin) protects liver cells from damage. The complete liver support stack.$48.99
NOW Foods - Selenium 200mcg, 180 CapsulesSelenium is required for glutathione peroxidase enzyme function. NAC + selenium maximizes the glutathione antioxidant pathway.$19.99Real reviews. A wider perspective.
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A few useful answers.
Research & further reading
More category questions
What is NAC used for?
NAC is the precursor to glutathione — the body's master antioxidant. It's used for liver detoxification, respiratory health (thins mucus), mental health (OCD, addiction, depression), immune support, and protecting against oxidative damage from toxins, alcohol, and environmental chemicals. It's also the standard ER treatment for acetaminophen overdose.
How much NAC should I take?
For general antioxidant support: 600mg 1-2x daily. For liver support: 1200-1800mg/day. For respiratory health: 600mg 2-3x daily. For mental health (OCD, addiction): 1200-2400mg/day (clinical study doses). Take on an empty stomach for best absorption.
Is NAC the same as glutathione?
No — NAC is a precursor that your body converts INTO glutathione. NAC has better oral bioavailability than direct glutathione supplements (which are largely destroyed in the stomach). NAC is generally more cost-effective for raising intracellular glutathione levels than oral glutathione, though liposomal glutathione is a viable alternative.
Can I take NAC every day?
Yes. NAC is well-tolerated for long-term daily use at standard doses (600-1800mg). It's water-soluble and excess is excreted. Common side effects are mild GI upset, which resolves by taking with food. There's no evidence of tolerance or need for cycling.
Does NAC help with hangovers?
NAC supports alcohol metabolism by boosting glutathione, which is depleted during alcohol detoxification. However, timing matters: take NAC BEFORE drinking (at least 30 minutes prior), not after. Taking NAC after alcohol may actually increase liver toxicity by interfering with the detoxification sequence.
Supplement information is provided for education and is not a substitute for personalized medical advice. Supplements are not intended to diagnose, treat, cure or prevent disease. Read the current product label before use.