Best NAC Supplements 2026
Evidence-based reviews of N-Acetyl Cysteine supplements for glutathione support, liver protection, respiratory health, and antioxidant defense — with clinical research citations
What Is NAC (N-Acetyl Cysteine)?
N-Acetyl Cysteine (NAC) is the acetylated form of the amino acid L-cysteine — a sulfur-containing precursor to glutathione, the human body's most abundant and biologically important endogenous antioxidant. While L-cysteine itself is unstable and poorly absorbed, the acetyl group attached to NAC significantly improves its stability and oral bioavailability, making it the preferred clinical strategy for raising intracellular glutathione levels — the ultimate goal of NAC supplementation.
Glutathione is a tripeptide (glutamate + cysteine + glycine) that serves as the cell's primary antioxidant defense system. It neutralizes reactive oxygen species (ROS), regenerates vitamins C and E, detoxifies xenobiotics in the liver via glutathione-S-transferase enzymes, supports immune cell function, and maintains intracellular redox balance. Cysteine — supplied by NAC — is the rate-limiting amino acid for glutathione synthesis. When cysteine is abundant, glutathione production ramps up; when it is depleted by oxidative stress, toxic exposures, aging, or illness, antioxidant defenses collapse. NAC directly addresses this bottleneck.
Beyond glutathione, NAC has direct pharmacological actions: it is a mucolytic agent that breaks disulfide bonds in mucus glycoproteins, reducing mucus viscosity in the lungs and airways; it is an antioxidant in its own right via its free thiol (-SH) group, which directly scavenges reactive oxygen and nitrogen species; it modulates glutamate neurotransmission via the cystine-glutamate antiporter system — a mechanism relevant to its psychiatric applications; and it acts as a direct hepatoprotective agent, which is why intravenous NAC remains the primary treatment for acetaminophen (Tylenol) overdose-induced liver failure in emergency medicine worldwide.
NAC's Clinical Track Record: NAC is one of the most extensively studied supplements in medicine, with over 40 years of clinical research and established use in emergency medicine (acetaminophen overdose), respiratory medicine (COPD, cystic fibrosis, bronchiectasis), psychiatry (OCD, bipolar depression, addiction), and nephrology (contrast-induced nephropathy prevention). Its breadth of evidence is matched by very few non-pharmaceutical compounds.
Quick Comparison
| Rank | Product | Form | Price | Rating |
|---|---|---|---|---|
| #1 | Thorne N-Acetyl Cysteine Thorne | Capsules | $30-40 | ★4.9 |
| #2 | NOW Foods NAC 600mg NOW Foods | Veg capsules | $14-20 | ★4.8 |
| #3 | Jarrow Formulas N-A-C Sustain 600mg Jarrow Formulas | Bi-layer tablets (sustained release) | $20-28 | ★4.7 |
| #4 | Pure Encapsulations NAC 900mg Pure Encapsulations | Capsules | $32-44 | ★4.7 |
| #5 | Life Extension N-Acetyl-L-Cysteine 600mg Life Extension | Capsules | $16-24 | ★4.6 |
Thorne N-Acetyl Cysteine
Thorne N-Acetyl Cysteine is the benchmark for clinical-grade NAC quality, combining NSF Certified for Sport verification with Thorne's practitioner-grade manufacturing standards. Each capsule delivers a verified 500mg of pharmaceutical-grade NAC — the most common unit dose used across clinical research. NAC functions as the rate-limiting precursor to glutathione synthesis: it supplies cysteine, the sulfur-containing amino acid that determines how much glutathione cells can produce. Because cells cannot directly absorb supplemental glutathione effectively, NAC is the preferred clinical strategy for elevating intracellular glutathione — the body's primary antioxidant defense against oxidative stress, toxic metabolites, and reactive oxygen species. Thorne's NSF certification confirms that this product delivers what the label claims, backed by independent analytical verification — an assurance that matters particularly in the NAC category, where adulterated products have been documented. For practitioners prescribing NAC as a glutathione precursor, liver support agent, or adjunct in respiratory and psychiatric protocols, Thorne remains the first-choice recommendation.
Key Features
- NSF Certified for Sport — independently verified for purity, potency, and absence of banned substances, the highest standard in dietary supplement testing
- Pharmaceutical-grade N-Acetyl Cysteine with verified 500mg per capsule across every production batch
- Hypoallergenic formulation: free from gluten, dairy, soy, artificial colors, and unnecessary excipients
- Thorne's GMP-certified in-house analytical laboratory provides batch-level quality verification before release
Pros & Cons
Pros:
- +NSF Certified for Sport provides the gold standard of independent quality assurance — critical for an amino acid compound where counterfeit or underdosed products are common in the category
- +Practitioner-trusted for over four decades in integrative medicine, functional medicine, and clinical nutrition — carries significant credibility for therapeutic protocols involving liver protection, respiratory support, and psychiatric adjunctive use
Cons:
- -Premium pricing — the highest cost per capsule on this list, reflecting NSF certification overhead, practitioner-grade manufacturing, and Thorne's in-house analytical infrastructure
- -Available primarily through Thorne's website, Amazon, and practitioner dispensaries — less accessible at retail pharmacies and general health food stores
NOW Foods NAC 600mg
NOW Foods NAC 600mg is the best-value NAC supplement for most adults seeking a reliable, GMP-certified product for daily glutathione support, antioxidant protection, or respiratory health at an accessible price. The 600mg dose per capsule aligns with the most common unit doses used across clinical research: 600mg/day for general antioxidant support, 1,200mg/day for respiratory and liver applications, and 1,800mg/day for psychiatric adjunctive use in OCD and addiction. NOW Foods' 50+ year GMP-certified manufacturing history — with in-house analytical laboratory verification — provides solid quality assurance at a fraction of the cost of premium brands. For individuals committing to sustained NAC supplementation for chronic applications (respiratory disease management, ongoing liver support, psychiatric adjunctive therapy), NOW Foods NAC offers the most practical combination of therapeutic dosing flexibility and long-term cost sustainability.
Key Features
- 600mg NAC per capsule — a dose aligned with the most common clinical trial unit doses and practical for flexible daily supplementation
- NOW Foods' 50+ year GMP-certified manufacturing with in-house third-party tested quality assurance
- Vegan vegetable capsule free from artificial colors, flavors, and preservatives; non-GMO verified
- No selenium added — a clean single-ingredient NAC product for stacking flexibility
Pros & Cons
Pros:
- +Exceptional price-to-quality ratio — NOW Foods delivers GMP-certified manufacturing at accessible price points that make sustained long-term NAC supplementation financially practical for most adults
- +Single-ingredient 600mg format allows precise dose management: one capsule provides the standard daily antioxidant support dose, two capsules reach 1,200mg for respiratory or liver-focused applications, and three capsules achieve the 1,800mg/day used in some OCD clinical trials
Cons:
- -No batch-specific Certificates of Analysis publicly posted; quality assurance relies on NOW's internal laboratory rather than independently published batch-level third-party data
- -Standard cellulose capsule does not provide extended or modified release — all NAC is released immediately in the stomach, which may reduce the duration of plasma NAC elevation compared to sustained-release formats
Jarrow Formulas N-A-C Sustain 600mg
Jarrow Formulas N-A-C Sustain is the best NAC product for individuals who prioritize compliance convenience and sustained plasma NAC availability throughout the day. The patented bi-layer tablet architecture delivers 200mg of NAC immediately upon ingestion — providing rapid onset of cysteine availability and glutathione synthesis stimulation — followed by gradual release of the remaining 400mg over 8+ hours from the sustained-release matrix. This pharmacokinetic profile addresses a genuine limitation of standard immediate-release NAC: the rapid absorption and hepatic first-pass metabolism of standard NAC produces a sharp concentration spike that may result in peak-and-trough glutathione synthesis support rather than continuous elevation. For chronic NAC applications including long-term respiratory disease management (COPD, bronchiectasis), ongoing liver support, or sustained psychiatric adjunctive use, once-daily sustained-release NAC significantly improves the practicality of maintaining therapeutic plasma levels consistently.
Key Features
- Patented bi-layer delivery system: 200mg immediate-release NAC for rapid onset + 400mg sustained-release matrix for prolonged plasma elevation over 8+ hours
- Single-tablet once-daily dosing option — the most convenient NAC supplementation format for compliance
- Sustained-release design maintains more consistent plasma cysteine availability throughout the day, potentially optimizing intracellular glutathione synthesis
- Jarrow Formulas' 40+ year track record in evidence-based nutritional supplementation with rigorous raw material standards
Pros & Cons
Pros:
- +Sustained-release technology addresses a key pharmacokinetic limitation of standard NAC: immediate-release NAC produces a sharp peak-and-trough plasma profile, while the bi-layer format extends plasma NAC elevation — theoretically optimizing continuous glutathione synthesis support
- +Once-daily dosing dramatically improves compliance for long-term protocols, which is clinically relevant since NAC's benefits for respiratory disease, liver health, and psychiatric conditions require consistent sustained use over weeks to months
Cons:
- -Tablet format (not capsule) — cannot be opened and mixed into liquids, which limits administration flexibility for individuals who have difficulty swallowing tablets
- -The clinical evidence base for sustained-release NAC specifically is smaller than for standard immediate-release NAC; while the pharmacokinetic rationale is sound, head-to-head comparative outcome studies are limited
Pure Encapsulations NAC 900mg
Pure Encapsulations NAC 900mg is the top choice for therapeutic high-dose NAC protocols where clinical research supports doses of 1,800mg/day or higher — including OCD adjunctive therapy, acetaminophen toxicity prevention, advanced COPD management, and aggressive liver support protocols. At 900mg per capsule, this product enables the 1,800mg/day dose with just two capsules daily — the simplest possible regimen for a therapeutic NAC protocol. Pure Encapsulations' commitment to hypoallergenic manufacturing is unmatched in the supplement industry: their strict exclusion of 125+ potential allergens and excipients makes this the default recommendation for immunocompromised patients, those with multiple chemical sensitivities, and individuals in clinical settings where contaminant exposure must be minimized. NSF Contents Certified verification confirms that the label claims are accurate. For integrative psychiatrists prescribing NAC for OCD, addiction recovery, or bipolar depression — and for functional medicine practitioners managing NAFLD, COPD, or chronic oxidative stress — Pure Encapsulations NAC 900mg provides the cleanest, most clinically appropriate high-dose format available.
Key Features
- 900mg NAC per capsule — one of the highest single-capsule doses available, enabling 1,800mg/day therapeutic protocols with just 2 capsules daily
- Pure Encapsulations' hypoallergenic standard: rigorously free from wheat, gluten, egg, peanuts, tree nuts, artificial colors, flavors, and sweeteners
- NSF Contents Certified — third-party verified for label accuracy and absence of undisclosed ingredients
- Manufactured in a GMP-certified facility following Pure Encapsulations' pharmaceutical-level quality standards used in clinical practice
Pros & Cons
Pros:
- +High-dose per capsule dramatically simplifies therapeutic protocols: 1,800mg/day (the dose used in OCD clinical trials and some liver protection protocols) requires only 2 capsules, versus 3–4 capsules with standard 500–600mg products — a meaningful compliance advantage
- +Pure Encapsulations' hypoallergenic manufacturing is among the most rigorous in the supplement industry, making this the preferred choice for individuals with multiple food sensitivities, autoimmune conditions, or those following elimination diets
Cons:
- -Highest price per bottle on this list — Pure Encapsulations' hypoallergenic manufacturing and NSF certification carry a premium that may not be necessary for all users
- -900mg per capsule offers less dose flexibility for individuals starting NAC supplementation who want to begin at lower doses; splitting or opening capsules is possible but inconvenient
Life Extension N-Acetyl-L-Cysteine 600mg
Life Extension N-Acetyl-L-Cysteine 600mg is the best option for cost-conscious users who want greater transparency than entry-level GMP brands provide but don't need the premium of NSF certification or hypoallergenic manufacturing. Life Extension's distinguishing strength is its certificate of analysis transparency: every production lot has a COA that documents potency and purity testing results, accessible for specific batch verification. This is particularly valuable for clinicians or researchers using NAC in documented protocols where quality verification is part of clinical record-keeping. At 600mg per capsule, the dosing is identical to NOW Foods NAC — one capsule for daily antioxidant support, two for 1,200mg respiratory/liver applications, three for the 1,800mg psychiatric dose. Life Extension's evidence-based research team also provides strong educational resources around NAC's clinical applications, making them a brand that supports informed supplementation decisions. For the combination of evidence-based formulation, batch-level COA transparency, and mid-range pricing, Life Extension represents a meaningful step up from basic commodity NAC while remaining accessible for long-term use.
Key Features
- Life Extension's evidence-based research team reviews primary literature for every ingredient selection and dosing decision
- Certificate of Analysis available for each production lot — full batch-level transparency on potency and purity for clinicians and researchers
- Non-GMO formula manufactured in GMP-certified facilities with NSF-registered quality management systems
- 600mg per capsule supports standard daily antioxidant protocols (600mg) and therapeutic applications (1,200–1,800mg/day with multiple capsules)
Pros & Cons
Pros:
- +Certificate of Analysis availability for each production batch is a meaningful transparency advantage — clinicians and researchers can verify potency for specific lots, which is valuable for clinical protocols where precise dosing matters
- +Life Extension's 45-year history of science-based supplement formulation and rigorous primary literature review provides credibility for their quality claims and formulation decisions
Cons:
- -Does not carry NSF or USP certification — batch-level COA transparency, while valuable, is less rigorous than independent third-party certification of manufacturing processes
- -Standard immediate-release capsule format without modified release — same pharmacokinetic profile as other immediate-release NAC products; for extended plasma coverage, Jarrow's Sustain format is preferred
How to Choose a Quality NAC Supplement
Dose Matters: Matching NAC Dose to Your Goal
NAC is remarkably dose-dependent: the dose required varies substantially across different clinical applications. 600mg/day is the standard dose for general antioxidant support and daily glutathione maintenance. 1,200–1,800mg/day is used in respiratory disease (COPD, bronchiectasis, cystic fibrosis) and liver support protocols. 1,800–2,400mg/day has been used in OCD clinical trials and addiction research. Up to 3,600mg/day is used in some research protocols for specific therapeutic goals. Choose a product whose capsule dose allows you to reach your target without taking an excessive number of capsules — 600mg or 900mg capsules are most practical for higher-dose applications.
Immediate vs. Sustained Release: Does It Matter?
Standard NAC supplements release all their NAC immediately upon dissolution in the stomach, producing a sharp peak in plasma NAC concentrations followed by a rapid decline. Sustained-release formats (like Jarrow N-A-C Sustain) maintain more consistent plasma NAC levels throughout the day by releasing NAC gradually over 8+ hours. The clinical significance of this distinction for most applications is debated — most NAC clinical trials used immediate-release products — but for individuals who want to optimize sustained glutathione synthesis support throughout the day, or who take NAC only once daily, the sustained-release format offers a theoretically better pharmacokinetic profile. For convenience-focused users, once-daily sustained-release NAC is meaningfully simpler than twice or three-times-daily immediate-release dosing.
Third-Party Testing: Non-Negotiable for Long-Term Use
NAC supplement quality varies significantly, and label accuracy problems have been documented in amino acid supplements broadly. Prioritize brands with NSF certification (Thorne), NSF Contents Certified (Pure Encapsulations), or accessible batch-level Certificates of Analysis (Life Extension) over products that only claim GMP compliance without independent verification. For therapeutic applications — OCD, respiratory disease, liver support — dosing precision matters clinically, and an underdosed product will produce no therapeutic benefit while creating a false impression of treatment failure.
The NAC Regulatory Situation
NAC's regulatory status has been contested in the United States. The FDA issued warning letters to several NAC supplement sellers in 2020–2021 arguing that NAC was excluded from dietary supplement status because it was first approved as a drug (as Mucomyst, for acetaminophen overdose treatment). However, the FDA has subsequently suspended enforcement on this position pending further regulatory review, and NAC supplements continue to be widely available. Be aware that this regulatory ambiguity may affect product availability from some manufacturers — choose established brands with stable supply chains for long-term therapeutic protocols.
Research on NAC and Its Clinical Applications
Liver Protection and Detoxification
NAC's most established clinical use is hepatoprotection. The landmark clinical application — intravenous NAC for acetaminophen (paracetamol) overdose — is the standard of care in emergency medicine worldwide, with a Cochrane review confirming its efficacy in preventing acetaminophen-induced liver failure when administered within the therapeutic window (up to 24 hours post-ingestion). The mechanism is glutathione replenishment: acetaminophen overdose depletes hepatic glutathione, allowing the toxic metabolite NAPQI to accumulate and cause hepatocyte necrosis. NAC restores the glutathione supply that neutralizes NAPQI, preventing or limiting liver damage. Beyond overdose, NAC has been studied for Non-Alcoholic Fatty Liver Disease (NAFLD) — a 2010 RCT found oral NAC (1,200mg/day for 12 weeks) significantly improved liver enzymes (ALT, AST) and liver histology scores in NAFLD patients versus placebo.
Research: Smilkstein et al. (1988), N Engl J Med; Khoshbaten et al. (2010), Eur J Gastroenterol Hepatol; Cochrane Review: Green et al. (2013).
Respiratory Health: COPD and Mucus Clearance
NAC is among the most studied supplements in respiratory medicine. Its mucolytic action — breaking disulfide bonds in mucus glycoproteins to reduce viscosity and improve clearance — is the basis of its prescription mucolytic use (Mucomyst) in Europe. A landmark meta-analysis by Grandjean et al. (2000) pooled 39 placebo-controlled trials and found oral NAC significantly reduced exacerbation frequency in chronic bronchitis patients. More recently, the PANTHEON trial (Tse et al., 2013), a large RCT of 1,320 COPD patients, found NAC (600mg twice daily, 1,200mg/day) reduced acute exacerbation rate by 22% over 12 months versus placebo — a clinically meaningful reduction with direct implications for quality of life and hospitalization rates. A 2021 meta-analysis in Respiratory Research confirmed NAC reduces exacerbation frequency, improves lung function measures, and reduces systemic oxidative stress biomarkers in COPD patients.
Research: Grandjean et al. (2000), Eur Respir J; Tse et al. (2013), Chest (PANTHEON trial); Cazzola et al. (2015), Respir Med.
Psychiatric Applications: OCD, Addiction, and Bipolar Disorder
NAC's psychiatric applications have emerged as one of the most active areas of research in the past 15 years, driven by its modulation of the cystine-glutamate antiporter (system Xc-). This transporter exchanges intracellular glutamate for extracellular cystine — a major pathway for maintaining extracellular glutamate homeostasis in the nucleus accumbens and prefrontal cortex. Dysregulation of extracellular glutamate is implicated in addiction, OCD, and bipolar disorder. A pivotal 2010 double-blind RCT by Grant et al. in the Biological Psychiatry journal found NAC (1,800mg/day for 12 weeks) significantly reduced compulsive gambling behavior. Subsequent research has found NAC effective as an OCD augmentation agent, a craving-reduction agent in cocaine and nicotine dependence, a depression adjunct in bipolar disorder, and a nail-biting/skin-picking (excoriation disorder) treatment. A 2016 meta-analysis across 33 NAC trials in psychiatric conditions found significant effects for depression, OCD spectrum, and substance use disorders.
Research: Grant et al. (2010), Biol Psychiatry; Minarini et al. (2017), Expert Opin Drug Metab Toxicol; Deepmala et al. (2015), Neurosci Biobehav Rev.
Antioxidant Defense and Aging
Glutathione levels decline with age — by approximately 50% between the ages of 20 and 70 — contributing to the progressive increase in oxidative stress associated with aging, cellular senescence, and age-related disease. NAC supplementation has been shown in multiple trials to significantly raise whole-blood and intracellular glutathione in older adults. A 2020 RCT by Kumar et al. found that NAC combined with glycine (GlyNAC) supplemented for 24 weeks in older adults restored erythrocyte glutathione concentrations to youthful levels, significantly reduced oxidative stress biomarkers (8-isoprostane, 8-OHdG), improved mitochondrial function, and improved multiple parameters of aging physiology including grip strength and gait speed. This suggests NAC — particularly in combination with glycine to provide the full complement of glutathione precursors — may have meaningful anti-aging applications beyond disease-specific indications.
Research: Kumar et al. (2020), Clin Transl Med (GlyNAC); Sekhar et al. (2011), Am J Clin Nutr; Townsend et al. (2003), Eur J Nutr.
Important Note: NAC supplements support antioxidant status, glutathione levels, and general health but do not prevent, treat, or cure any medical condition. The psychiatric and respiratory applications described above reflect research conducted in clinical settings with medical supervision. Individuals with psychiatric disorders, respiratory disease, or liver conditions should consult a qualified healthcare provider before using NAC supplements.
NAC Dosing by Goal
General Antioxidant & Glutathione Support
- Dose: 600mg once daily, with or without food
- Timing: Morning with breakfast for daily antioxidant support and baseline glutathione maintenance
- Stack with: Vitamin C (500–1,000mg) — synergistically regenerates oxidized glutathione; selenium (100–200mcg) — cofactor for glutathione peroxidase
Respiratory Health (COPD, Bronchiectasis, Chronic Bronchitis)
- Dose: 600mg twice daily (1,200mg/day) — dose used in the PANTHEON trial demonstrating 22% exacerbation reduction
- Timing: With breakfast and dinner; food co-ingestion reduces the GI discomfort that some individuals experience with higher NAC doses
- Duration: Effects accumulate over weeks to months; commit to minimum 3–6 months before assessing respiratory outcomes
- Note: Discuss with your pulmonologist or respiratory physician before starting — NAC can interact with nitroglycerin and may affect bronchospasm in some asthma patients
Liver Support & Detoxification
- Dose: 600–1,200mg daily (600mg twice daily for active liver support)
- Stack with: Milk thistle (silymarin 140mg 2–3x daily) — complementary hepatoprotective mechanisms via different pathways; Alpha-lipoic acid (ALA 300–600mg) — also raises glutathione and supports liver antioxidant defense
- Caution: Consult a physician if you have diagnosed liver disease, cirrhosis, or are taking hepatically metabolized medications
Psychiatric Adjunctive Use (OCD, Anxiety, Addiction Support)
- Dose: 1,800–2,400mg/day (900mg twice daily or 600mg three times daily)
- Duration: 8–12 week minimum to assess psychiatric outcomes; OCD trials typically ran 12–16 weeks
- Critical: Use only as an adjunct to established psychiatric care — NAC is not a standalone treatment for OCD, addiction, or any psychiatric disorder
- Note: Always discuss psychiatric NAC use with your prescribing psychiatrist, as it may affect glutamate-based medications
Anti-Aging: The GlyNAC Protocol
The GlyNAC protocol — NAC plus glycine in a 1:1 ratio — provides all three glutathione precursors (glutamate from dietary intake; cysteine from NAC; glycine from supplementation) and has demonstrated the most comprehensive glutathione restoration in aging research. Suggested doses: NAC 600–900mg + glycine 600–900mg twice daily. Stack with CoQ10 (100–200mg/day) for mitochondrial support and R-Alpha Lipoic Acid (ALA) for synergistic antioxidant network amplification.
Safety notes: NAC is generally well tolerated at supplemental doses (600–1,800mg/day). Common mild side effects include GI discomfort, nausea, and the characteristic sulfurous smell. NAC may interact with nitroglycerin (cardiovascular vasodilation), activated charcoal, and some chemotherapy agents. Do not use NAC if you have a history of cystinuria (a rare condition causing cysteine kidney stones). Pregnancy and breastfeeding: consult a healthcare provider before use.
Our Verdict: Best NAC Supplement for 2026
For most adults seeking a reliable, high-quality NAC supplement for daily glutathione support or general antioxidant health, Thorne N-Acetyl Cysteine is our top recommendation — NSF certification, practitioner-grade manufacturing, and 40+ years of clinical trust make it the most defensible choice for those who want absolute confidence in what they're taking.
Budget-conscious users will find NOW Foods NAC 600mg delivers excellent GMP-certified quality at a fraction of the premium price — and the 600mg capsule format provides sufficient flexibility to reach any therapeutic dose from 600mg to 1,800mg/day. For those committed to long-term protocols, NOW's price makes sustained supplementation financially sustainable.
For high-dose therapeutic applications — OCD adjunctive therapy, advanced respiratory disease management, or aggressive liver support — Pure Encapsulations NAC 900mg simplifies dosing and offers the cleanest hypoallergenic formulation available. And for once-daily dosing convenience with a better pharmacokinetic profile, Jarrow N-A-C Sustain remains the only sustained-release NAC option on the market with a meaningful clinical rationale behind its formulation.
Related Supplement Guides
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Disclaimer: As an Amazon Associate, we earn from qualifying purchases at no extra cost to you. The information provided is for educational purposes only and is not medical advice. NAC supplements support antioxidant status and general health but do not prevent, treat, or cure any disease. The psychiatric and respiratory applications described reflect clinical research conducted under medical supervision and are not endorsements of self-treatment. Consult a healthcare provider before starting NAC, especially if you have liver disease, respiratory disease, psychiatric conditions, are pregnant or breastfeeding, or take nitroglycerin, activated charcoal, or chemotherapy agents.