Top 10 Best NAC (N-Acetylcysteine) Supplements (2026)
01 · Best Overall✓ Label verified · Supplement Facts read Sep 7, 2026Best Overall — Cleanest Sourcing: Pure Encapsulations NAC 600 mg (Freeform N-Acetyl-L-Cysteine), 90 Capsules
The practitioner-grade pick: a hypoallergenic, freeform 600 mg NAC with the tightest sourcing and independent-testing reputation in the category — you pay for verified purity, not marketing.
$33.90~$0.38 per 600 mg capsule
Why it wins: all five scores, pros & cons, full label
- Hypoallergenic, practitioner-grade sourcing with a long independent-quality track record
- Freeform, excipient-light formula suits sensitive and reactive users
- 600 mg sits squarely in the studied oral range
- Roughly 3–4x the per-capsule cost of NOW or Nutricost for a chemically identical molecule
- Only 90 capsules — runs out in three months
- Plain NAC with no absorption or dose advantage over cheaper bottles
- Standardization
- Freeform L-cysteine base, no unnecessary excipients
- Cost per dose
- ~$0.38 per 600 mg dose
- Dose
- 600 mg per capsule (mid clinical range)
- Form
- Plain (immediate-release) hypoallergenic veg capsule
- Count
- 90 capsules (3-month supply at 1/day)
- Testing
- Third-party tested, certified gluten-free, non-GMO, hypoallergenic
Our take — If you want the least-adulterated, best-verified NAC and will pay for that peace of mind, this is the one. It earns #1 on testing rigor and tolerability, not on the NAC itself — the molecule is identical to the $0.10/cap options. Buy it specifically for the hypoallergenic guarantee; otherwise NOW delivers 80% of the value for a quarter of the price.
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10Who Wins Which Aspect
Sorted by overall SAC Product Score™ — the official ranking.
| # | Pick | Score | Form & Bioavailability25% | Third-Party Testing & Purity25% | Dose vs Clinical Range20% | Tolerability & Safety15% | Value15% | Cost Per Dose | Buy |
|---|---|---|---|---|---|---|---|---|---|
| 01 | | 8.4 | 8.01 | 9.51 | 8.51 | 8.81 | 6.5 | ~$0.38 / 600 mg dose | Check price |
| Hypoallergenic, practitioner-grade sourcing with a long independent-quality track recordRoughly 3–4x the per-capsule cost of NOW or Nutricost for a chemically identical molecule | |||||||||
| 02 | | 8.0 | 7.43 | 8.23 | 8.02 | 8.02 | 8.81 | ~$0.10 / 600 mg dose | Check price |
| Unbeatable cost per dose with an 8-month supply per bottleTesting is in-house rather than a per-batch third-party COA | |||||||||
| 03 | | 7.6 | 7.52 | 8.82 | 7.53 | 8.02 | 5.8 | ~$0.22 / 600 mg dose | Check price |
| Carries genuine third-party product seals, not just facility claimsMore than double NOW's cost per dose for the same molecule | |||||||||
| 04 | | 7.2 | 7.0 | 7.8 | 7.3 | 7.33 | 6.0 | ~$0.19 / 600 mg dose | Check price |
| Publishes a COA per product — real batch-level transparencyThe label's liver/detox framing leans on IV/high-dose data, not oral 600 mg evidence | |||||||||
| 05 | | 6.9 | 6.8 | 6.5 | 7.0 | 7.0 | 7.62 | ~$0.10 / 600 mg dose | Check price |
| Rock-bottom cost per dose with a 6-month supply'NSF-certified facility' describes the plant, not an NSF Certified for Sport product seal | |||||||||
| 06 | | 6.7 | 6.8 | 6.0 | 7.0 | 7.0 | 7.33 | ~$0.11 / 600 mg dose | Check price |
| One 600 mg NAC capsule per serving at about $0.11 per capsuleNSF facility claim could not be confirmed, and PrimaForce is not in NSF's product, 173 or Certified for Sport listings | |||||||||
| 07 | | 6.6 | 6.8 | 7.0 | 7.0 | 5.0 | 6.8 | ~$0.24 / 1,000 mg serving | Check price |
| Explicit heavy-metal testing results referenced on the listingThat same sulfur 'rotten egg' smell makes the caps genuinely unpleasant to take | |||||||||
| 08 | | 6.2 | 6.5 | 7.5 | 5.0 | 5.0 | 6.5 | ~$0.25 / 1,300 mg serving | Check price |
| Rare published standardized purity floor (98%+)1,300 mg/serving sits above the range most human oral data used — more isn't established as better | |||||||||
| 09 | | 5.8 | 6.5 | 6.5 | 5.0 | 6.0 | 4.5 | ~$1.33 / 2,000 mg combined serving | Check price |
| GlyNAC pairing targets the full glutathione-synthesis pathway, not just cysteine supplyThe landmark Baylor GlyNAC trials dosed ~0.8 g/kg/day — often far more than one serving here delivers, and were small and unblinded | |||||||||
| 10 | | 5.5 | 5.0 | 5.8 | 6.0 | 5.5 | 5.0 | ~$0.23 / 600 mg tablet | Check price |
| Only true sustained-release format in the group — a reasonable idea for NAC's short plasma half-lifeSustained release is NOT clinically proven to outperform standard NAC for any endpoint | |||||||||
The Other 9, Ranked
- 02
Best Value — Editor's Default: NOW NAC 600 mg with Selenium & Molybdenum, 250 Veg Capsules
8.0SAC Score™The bottle we'd actually buy for daily use: 8-plus months of clinically-dosed NAC at a dime a capsule, from one of the most transparent testing labs in the supplement industry.
StrongestValue8.81WeakestForm & Bioavailability7.4- Standardization
- Vegan, non-GMO, soy/gluten/dairy-free
- Cost per dose
- ~$0.10 per 600 mg dose — the category value benchmark
- Dose
- 600 mg per capsule + 25 mcg selenium, 25 mcg molybdenum
All five scores, pros & cons, full label
What We Like- Unbeatable cost per dose with an 8-month supply per bottle
- NOW's in-house lab is unusually transparent and publicly documented
- 600 mg dose plus sulfur-metabolism cofactors, no dose overshoot
What You Live With- Testing is in-house rather than a per-batch third-party COA
- The 25 mcg selenium is a token marketing dose, not a meaningful one
- Plain capsule with no absorption enhancement
- Form
- Plain NAC capsule with selenium + molybdenum cofactors
- Count
- 250 veg capsules (8+ month supply)
- Testing
- NOW in-house UL-audited GMP lab (well-documented, but in-house)
Our take — For most people this is the correct purchase: a properly dosed, well-tested NAC that costs almost nothing per day. It loses #1 only because its excellent lab is in-house rather than independent per batch. Ignore the selenium hype and treat this as a clean, honest value NAC — because that's exactly what it is.
- 03
Best Certified Clean Label: Sports Research Vegan NAC 600 mg, 90 Veggie Capsules
7.6SAC Score™For buyers who want actual product seals — Non-GMO Project Verified and Vegan Certified — on a no-filler 600 mg capsule with the sulfur smell masked out.
StrongestThird-Party Testing & Purity8.82WeakestValue5.8- Standardization
- Non-GMO Project Verified + Vegan Certified seals
- Cost per dose
- ~$0.22 per 600 mg dose
- Dose
- 600 mg per capsule
All five scores, pros & cons, full label
What We Like- Carries genuine third-party product seals, not just facility claims
- Filler-free formula with a lemon-zest odor mask for the sulfur smell
- Clinically-standard 600 mg dose in a clean veggie cap
What You Live With- More than double NOW's cost per dose for the same molecule
- 90-count is only a 3-month supply
- Certifications, not bioavailability, are what you're paying the premium for
- Form
- Plain NAC veggie capsule, no fillers or flow agents
- Count
- 90 capsules (3-month supply)
- Testing
- Third-party tested, cGMP USA, gluten/soy-free
Our take — The best choice if verifiable clean-label seals matter to you and you'll pay for them. It's a genuinely well-certified 600 mg NAC with the odor problem solved. Just be clear-eyed that the premium buys logos and pleasantness, not stronger effects.
- 04
Best Low-Commitment Trial: Life Extension N-Acetyl-L-Cysteine 600 mg, 60 Capsules
7.2SAC Score™One of the few mainstream brands that publishes a per-product Certificate of Analysis, in a small 60-cap bottle that's a low-risk way to trial NAC before committing.
StrongestThird-Party Testing & Purity7.8WeakestValue6.0- Standardization
- Non-GMO, gluten-free, made in USA
- Cost per dose
- ~$0.19 per 600 mg dose
- Dose
- 600 mg per capsule
All five scores, pros & cons, full label
What We Like- Publishes a COA per product — real batch-level transparency
- Low sticker price and small bottle make trialing NAC cheap and easy
- Dose and positioning match the liver/respiratory/immune angle
What You Live With- The label's liver/detox framing leans on IV/high-dose data, not oral 600 mg evidence
- 60 capsules run out fast, so per-dose cost isn't as low as it looks
- Standard immediate-release capsule, no format advantage
- Form
- Plain NAC capsule
- Count
- 60 capsules (2-month trial supply)
- Testing
- Per-product Certificate of Analysis available on request
Our take — A smart entry point: COA transparency and a cheap, small bottle let you test tolerance before buying in bulk. It's docked for a label that implies more 'detox' benefit than oral NAC has earned. Trial it here, then graduate to NOW for the long haul.
- 05
Cheapest Per Dose: Nutricost N-Acetyl L-Cysteine 600 mg, 180 Capsules
6.9SAC Score™The bare-bones budget benchmark: single-ingredient 600 mg NAC at the lowest per-dose price among mainstream third-party-tested brands.
StrongestValue7.62WeakestThird-Party Testing & Purity6.5- Standardization
- Non-GMO, gluten-free, single-ingredient
- Cost per dose
- ~$0.10 per 600 mg dose
- Dose
- 600 mg per capsule
All five scores, pros & cons, full label
What We Like- Rock-bottom cost per dose with a 6-month supply
- Clean single-ingredient formula, no unnecessary additives
- Clinically-standard 600 mg dose
What You Live With- 'NSF-certified facility' describes the plant, not an NSF Certified for Sport product seal
- No per-batch Certificate of Analysis published
- No format or absorption advantage
- Form
- Plain NAC capsule, no fillers or cofactors
- Count
- 180 capsules (6-month supply)
- Testing
- Third-party tested; made in NSF-registered/FDA-registered GMP facility (facility cert, not a product seal)
Our take — If price is your only tie-breaker, this and NOW are the two to compare. Nutricost matches NOW on cost but trails it on documented testing transparency, which is why it sits mid-pack rather than near the top. Perfectly adequate NAC; just don't read the facility certification as a product-level guarantee.
- 06
Plain 150-Count Bottle: PrimaForce NAC (N-Acetyl L-Cysteine) 600 mg, 150 Vegan Capsules
6.7SAC Score™A plain single-active 600 mg NAC in a vegan capsule at about $0.11 a dose. The panel is clean; the testing is a printed 'Third Party Tested' line that we could not confirm at NSF.
StrongestValue7.33WeakestThird-Party Testing & Purity6.0- Standardization
- Other ingredients: rice flour, magnesium stearate, stearic acid (vegetable sources)
- Cost per dose
- ~$0.11 per 600 mg dose
- Dose
- 600 mg per capsule, label directs 1 capsule daily
All five scores, pros & cons, full label
What We Like- One 600 mg NAC capsule per serving at about $0.11 per capsule
- Short panel: single active, vegan capsule, no cofactors or blends
- 150 capsules gives a 5-month supply at one a day
What You Live With- NSF facility claim could not be confirmed, and PrimaForce is not in NSF's product, 173 or Certified for Sport listings
- No per-batch certificate of analysis published; the pack names no manufacturer
- No absorption or odor advantage, and a little more per capsule than Nutricost
- Form
- Plain NAC (vegan) in a hypromellose capsule; no cofactors
- Count
- 150 capsules (5-month supply at 1/day)
- Testing
- 'Third Party Tested' printed on the pack; NSF facility claim not confirmed; not in NSF product, 173 or Certified for Sport listings; no COA found
Our take — A competent, no-frills NAC for the buyer who wants 600 mg per capsule at a low price and is comfortable taking the testing on trust. The panel does what it says; the testing line is a claim, not a seal. For documented lab work step up to NOW, and for the lowest price per capsule look at Nutricost.
- 07
Best for Dose Titration: Double Wood NAC 500 mg per cap / 1000 mg per serving, 210 Capsules
6.6SAC Score™Genuine, un-deodorized NAC in 500 mg caps so you can titrate 500/1,000/1,500 mg — heavy-metal tested, with a sulfur smell that proves it's the real thing.
StrongestThird-Party Testing & Purity7.0WeakestTolerability & Safety5.0- Standardization
- 99%+ purity, third-party tested
- Cost per dose
- ~$0.24 per 1,000 mg serving
- Dose
- 500 mg per capsule; 1,000 mg per 2-cap serving
All five scores, pros & cons, full label
What We Like- Explicit heavy-metal testing results referenced on the listing
- 500 mg caps allow flexible dose titration across the clinical range
- Strong sulfur odor confirms authentic, un-masked NAC material
What You Live With- That same sulfur 'rotten egg' smell makes the caps genuinely unpleasant to take
- No absorption enhancement over any other plain NAC
- Titration flexibility is the main selling point, not any efficacy edge
- Form
- Plain NAC capsule, non-deodorized (potent sulfur smell)
- Count
- 210 capsules (105 servings)
- Testing
- Heavy-metal panel (lead/cadmium/arsenic/mercury) referenced on listing
Our take — The pick for people who want to dial their dose precisely and value published heavy-metal data. It loses ground purely on tolerability — the authentic sulfur smell many buyers dislike is normal, not spoilage, but it's still off-putting. A solid, honest mid-tier bottle for the odor-tolerant tinkerer.
- 08
Highest Dose (Use With Caution): Toniiq NAC 1300 mg (min. 98% tested purity), 240 Vegetarian Capsules
6.2SAC Score™A published 98%+ purity floor and a 1,300 mg-per-serving hit for those chasing the top of the range — but that dose overshoots most human data and raises GI-upset odds.
StrongestThird-Party Testing & Purity7.5WeakestDose vs Clinical Range5.0- Standardization
- Published minimum 98% purity floor — unusual for the category
- Cost per dose
- ~$0.25 per 1,300 mg serving
- Dose
- 1,300 mg per 2-cap serving (above the 600–1,200 mg studied band)
All five scores, pros & cons, full label
What We Like- Rare published standardized purity floor (98%+)
- Strong per-milligram value across a 4-month supply
- Useful if a clinician has specifically directed a higher dose
What You Live With- 1,300 mg/serving sits above the range most human oral data used — more isn't established as better
- Higher dose raises the odds of GI upset
- Purity testing verifies the raw material, not clinical benefit
- Form
- Plain high-strength NAC capsule (650 mg each)
- Count
- 240 capsules (120 servings, 4-month supply)
- Testing
- Third-party lab tested, GMP-certified USA facility
Our take — Toniiq does the testing part well, but the whole product is built around a dose the evidence doesn't ask for. We penalized it precisely because overshooting the studied range isn't an upgrade — it's a risk with no proven payoff. Only worth it if you specifically need the higher dose and titrate up carefully.
- 09
Most On-Mechanism (Early Science): Utzy Naturals High Dose GlyNAC+ (2,000 mg Glycine + NAC) with Vitamin B2, 90 Capsules
5.8SAC Score™The GlyNAC angle in a bottle — glycine + NAC + riboflavin targets glutathione synthesis more completely than NAC alone, but the headline human trials used far more, and were small.
StrongestForm & Bioavailability6.5WeakestValue4.5- Standardization
- Adds riboflavin (B2) as a glutathione-recycling cofactor
- Cost per dose
- ~$1.33 per 2,000 mg combined serving
- Dose
- 2,000 mg combined glycine + NAC per serving (not 2,000 mg of each)
All five scores, pros & cons, full label
What We Like- GlyNAC pairing targets the full glutathione-synthesis pathway, not just cysteine supply
- Includes vitamin B2 as a mechanistically relevant recycling cofactor
- Matches the most interesting current research direction for aging and glutathione
What You Live With- The landmark Baylor GlyNAC trials dosed ~0.8 g/kg/day — often far more than one serving here delivers, and were small and unblinded
- The '2,000 mg' is glycine + NAC combined, obscuring how much of each you actually get
- Most expensive bottle here by a wide margin
- Form
- GlyNAC combo capsule (glycine + NAC + vitamin B2 cofactor)
- Count
- 90 capsules
- Testing
- Third-party tested, GMP, non-GMO
Our take — Scientifically the most interesting product on the list and the best fit for the glutathione story — which is exactly why we won't overstate it. The GlyNAC human evidence is promising but early, small, and used bigger doses than this serving provides. Buy it as an informed early adopter, not because the label's math matches the trials.
- 10
Unproven Delivery Gimmick: Jarrow Formulas N-A-C Sustain 600 mg, 60 Bilayer Sustained-Release Tablets
5.5SAC Score™The only sustained-release NAC here — a bilayer tablet meant to smooth NAC's short half-life. Plausible engineering, but no clinical proof it beats a plain capsule for any outcome.
StrongestDose vs Clinical Range6.0WeakestForm & Bioavailability5.0- Standardization
- Non-GMO, gluten-free, made in USA
- Cost per dose
- ~$0.23 per 600 mg tablet
- Dose
- 600 mg per tablet
All five scores, pros & cons, full label
What We Like- Only true sustained-release format in the group — a reasonable idea for NAC's short plasma half-life
- Standard, well-studied 600 mg dose
- Longstanding, widely reviewed liver-support SKU
What You Live With- Sustained release is NOT clinically proven to outperform standard NAC for any endpoint
- Weakest testing credentials here — no third-party product seal or COA advertised
- Label warns NAC can transiently alter liver-function blood tests — flag it before bloodwork
- Form
- Bilayer sustained-release tablet (1/3 immediate + 2/3 sustained)
- Count
- 60 tablets (2-month supply)
- Testing
- No third-party product testing or per-batch COA advertised
Our take — An interesting format resting on a promise the data don't back up, paired with the thinnest testing story on the list — which is why it lands last. The half-life logic is sound in theory but untested in outcomes, so you're paying a delivery premium for a maybe. If you're set on Jarrow, the plain capsule versions are a safer value; just tell your doctor before any liver panel.
NAC (N-Acetylcysteine) In Two Short Lessons
Read the dose, not the 'combined mg'.
Labels blur doses with GlyNAC combined totals and 1,300 mg overshoots. Compare the NAC per serving against what human oral trials tested.
Buy a tested product.
Third-party testing and purity carry a quarter of our score. NAC was first approved as a drug, and its supplement status has shifted more than once.
Ignore the 'detox' halo.
NAC's strongest evidence is as a hospital antidote for acetaminophen poisoning. Oral NAC has modest signals as a mucolytic and in fatty liver, not proof it detoxifies a healthy liver.
Synthesis of Cochrane mucolytic reviews, the Prescott IV-NAC paracetamol landmark, NAFLD enzyme trials, GlyNAC aging RCTs, and systematic reviews of NAC in psychiatry/neurology (PMIDs listed in Sources).
Every plain NAC capsule contains the same molecule, so raw 'potency' is a weak differentiator. We scored what actually varies between bottles and what actually maps to the thin oral-NAC evidence base: whether the delivery form does anything, whether an independent lab verified purity and heavy metals, whether the per-serving dose sits inside the 600–1,200 mg range human studies used, how tolerable and safe the product is in practice, and only then value. Price is capped at 15% and can never buy a product to the top — a cheaper bottle wins ties, not podiums. We deliberately penalized dose-overshoot, unproven 'delivery' gimmicks, and testing claims that describe the factory rather than the batch.
Form & Bioavailability · 25%
Does the format add anything real? Plain immediate-release NAC is the studied baseline. Sustained-release and GlyNAC pairings score on mechanism plausibility but are docked for lacking outcome data proving they beat standard NAC. Absorption-enhancement claims with no data earn no credit.
Third-Party Testing & Purity · 25%
We reward per-batch Certificates of Analysis, published purity floors, heavy-metal panels, and real product seals (NSF Certified for Sport, Non-GMO Project Verified). We discount 'made in an NSF/GMP facility' language, which certifies the plant, not the pill you swallow.
Dose vs Clinical Range · 20%
600–1,200 mg/day covers most oral human trials. Products landing squarely in that band score highest; those forcing you above 1,200 mg or leaving the effective dose ambiguous (e.g. a combined 'glycine + NAC' number) are penalized because more is not established as better and raises GI risk.
Tolerability & Safety · 15%
NAC's sulfur odor, GI upset odds, capsule cleanliness, allergen profile, and label safety disclosures (it can transiently skew liver-function bloodwork). Cleaner, better-masked, hypoallergenic products score higher; genuinely un-deodorized 'rotten egg' material scores lower even when it signals authenticity.
Value (cost per effective dose) · 15%
Cost per clinically meaningful serving, supply length, and whether any premium buys verified quality versus just a logo. A tie-breaker only — a rock-bottom price never lifts a product past better-tested rivals.
The bottom line
Buy NOW Foods unless you have a specific reason not to.
For the overwhelming majority of buyers, a clinically-dosed 600 mg NAC at a dime a capsule from a transparent lab is the rational default. Pure Encapsulations wins the ranking on testing rigor and tolerability, but NOW delivers most of that quality at a quarter of the cost — it's the value-per-dose champion and our everyday pick.
Pay the Pure Encapsulations premium only if you truly need hypoallergenic sourcing.
Its #1 finish is earned on verified purity, allergen-free formulation, and independent-testing reputation — not on the NAC, which is identical to every cheaper bottle. If you're sensitive, reactive, or simply want the most-scrutinized product, it's worth 3–4x the price. Otherwise you're buying reassurance.
Avoid dose overshoot and unproven delivery gimmicks.
Toniiq's 1,300 mg and Jarrow's sustained-release both charge for features the evidence doesn't reward — more milligrams and a smoother curve are not established as better outcomes, and Toniiq's higher dose raises GI risk. GlyNAC (Utzy) is the one speculative format worth watching, but as an informed early adopter, not because the label matches the trials.
Quick Answers
What is the best nac (n-acetylcysteine) pick overall?
Pure Encapsulations NAC 600 mg (Freeform N-Acetyl-L-Cysteine), 90 Capsules by Pure Encapsulations is our #1 pick (SAC score 8.4/10). If you want the least-adulterated, best-verified NAC and will pay for that peace of mind, this is the one. It earns #1 on testing rigor and tolerability, not on the NAC itself — the molecule is identical to the $0.10/cap options. Buy it specifically for the hypoallergenic guarantee; otherwise NOW delivers 80% of the value for a quarter of the price.
What is the best budget option?
NOW NAC 600 mg with Selenium & Molybdenum, 250 Veg Capsules at $24.99. For most people this is the correct purchase: a properly dosed, well-tested NAC that costs almost nothing per day. It loses #1 only because its excellent lab is in-house rather than independent per batch. Ignore the selenium hype and treat this as a clean, honest value NAC — because that's exactly what it is.
How much do these picks cost?
Across our ranked picks, prices run from about $11.25 to $39.95 — exact price and cost per serving are listed on every pick card above.
How were these picks ranked?
Every plain NAC capsule contains the same molecule, so raw 'potency' is a weak differentiator. We scored what actually varies between bottles and what actually maps to the thin oral-NAC evidence base: whether the delivery form does anything, whether an independent lab verified purity and heavy metals, whether the per-serving dose sits inside the 600–1,200 mg range human studies used, how tolerable and safe the product is in practice, and only then value. Price is capped at 15% and can never buy a product to the top — a cheaper bottle wins ties, not podiums. We deliberately penalized dose-overshoot, unproven 'delivery' gimmicks, and testing claims that describe the factory rather than the batch.
Every Claim Ranked Above Traces Back To One Of These
5 peer-reviewed sources, each linked to PubMed
- [1] Prescott LF, Illingworth RN, Critchley JA, Stewart MJ, Adam RD, Proudfoot AT. Intravenous N-acetylcystine: the treatment of choice for paracetamol poisoning. Br Med J. 1979;2(6198):1097-1100. PMID 519312 — Intravenous N-acetylcystine: the treatment of choice for paracetamol poisoning. Established IV N-acetylcysteine as the standard, life-saving antidote for acetaminophen poisoning by restoring glutathione — the landmark clinical use behind NAC's liver reputation, and evidence far stronger than that for routine oral supplementation.
- [2] Poole P, Sathananthan K, Fortescue R. Mucolytic agents versus placebo for chronic bronchitis or chronic obstructive pulmonary disease. Cochrane Database Syst Rev. 2019;5:CD001287. PMID 31107966 — Mucolytic agents versus placebo for chronic bronchitis or chronic obstructive pulmonary disease. Meta-analysis finding oral mucolytics including NAC modestly reduce exacerbations in chronic bronchitis/COPD — a genuine but modest oral-NAC benefit in a patient population, not proof of general 'detox' effects.
- [3] Deepmala, Slattery J, Kumar N, et al. Clinical trials of N-acetylcysteine in psychiatry and neurology: A systematic review. Neurosci Biobehav Rev. 2015;55:294-321. PMID 25957927 — Clinical trials of N-acetylcysteine in psychiatry and neurology: A systematic review. Systematic review documenting NAC's adjunctive signals across psychiatric and neurological conditions while emphasizing heterogeneous, often preliminary evidence — supporting the 'mental-health adjunct' angle with honest caveats.
- [4] Kumar P, Liu C, Suliburk J, et al. Supplementing Glycine and N-Acetylcysteine (GlyNAC) in Older Adults Improves Glutathione Deficiency, Oxidative Stress, Mitochondrial Dysfunction, Inflammation, Physical Function, and Aging Hallmarks: A Randomized Clinical Trial. J Gerontol A Biol Sci Med Sci. 2023;78(1):75-89. PMID 35975308 — Supplementing Glycine and N-Acetylcysteine (GlyNAC) in Older Adults: A Randomized Clinical Trial. Small randomized trial reporting GlyNAC improved glutathione and multiple aging markers in older adults — the headline evidence for the GlyNAC format, but limited by small size and weight-based dosing higher than typical supplement servings.
- [5] Khoshbaten M, Aliasgarzadeh A, Masnadi K, et al. N-Acetylcysteine improves liver function in patients with non-alcoholic Fatty liver disease. Hepat Mon. 2010;10(1):12-16. PMID 22308119 — N-Acetylcysteine improves liver function in patients with non-alcoholic fatty liver disease. Small clinical study reporting oral NAC improved liver enzyme levels in non-alcoholic fatty liver disease — a modest, real liver signal for oral NAC in a patient population, not proof of benefit in healthy livers.
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