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Thorne vs Life Extension NAC (2026)
Disclosure: We earn commissions on purchases made through our links. This never influences our scores. Editorial policy
The Verdict
Thorne edges Life Extension on our rubric (87 vs 86 on our 0-100 execution score), an essentially even match, but Life Extension is far cheaper, at about $0.42 per dose versus Thorne's $0.73, and delivers a full 600mg per capsule against Thorne's 500mg. Thorne's advantage is NSF Certified for Sport. In our view, if you need NSF Certified for Sport, Thorne is the pick; otherwise Life Extension gives you a higher per-capsule dose at a lower cost. Both are clean, tested NAC.
NAC (N-Acetyl Cysteine) 500mg, 90 Capsules
Thorne
N-Acetyl-L-Cysteine (NAC) 600 mg, 60 Capsules
Life Extension
Head-to-Head Comparison
| Category | NAC (N-Acetyl Cysteine) 500mg, 90 Capsules Thorne | N-Acetyl-L-Cysteine (NAC) 600 mg, 60 Capsules Life Extension |
|---|---|---|
| Brand Score | 87/100Winner | 86/100 |
| Dosing & Form | 25/25Winner | 25/25 |
| Purity | 23/25Winner | 19/25 |
| Value | 16/25 | 19/25Winner |
| Transparency | 23/25Winner | 23/25 |
| Cost/Day | $0.73 | $0.42Winner |
| Dose/Serving | 500mg | 600mg |
| Form | N-acetyl cysteine capsule | N-acetyl-L-cysteine capsule |
| Third-Party Tested | ✓ Yes | ✓ Yes |
| Proprietary Blend | No | No |
Why This Comparison Matters
Thorne and Life Extension both make a clean, single-ingredient NAC, but at different price and certification tiers. Thorne's is 500mg per capsule with NSF Certified for Sport; Life Extension delivers a full 600mg per capsule at a much lower cost with its own certified testing. This is the practitioner-grade-versus-value NAC decision.
NAC is a single, well-defined compound, so the decision is about dose per capsule, certification, and cost rather than formulation. Both are reputable brands that publish testing.
We scored both on evidence, quality, cost per dose, and transparency.
Detailed Score Breakdown
NAC (N-Acetyl Cysteine) 500mg, 90 Capsules
Thorne
500mg per capsule; two capsules (1,000mg) hit the 600-1,800mg daily range used in major COPD and influenza trials
NSF Certified for Sport and manufactured in a TGA-certified facility - among the highest quality standards available
$0.73/day at 1,000mg (2 capsules) after a price rise - the priciest option here, but the only NSF Certified for Sport NAC
Full label disclosure, no proprietary blends, form and source clearly specified
NSF Certified for Sport with TGA-certified manufacturing - the gold standard for verified NAC. Trusted by practitioners and athletes.
N-Acetyl-L-Cysteine (NAC) 600 mg, 60 Capsules
Life Extension
Standard 600mg clinical dose per capsule
Non-GMO LE Certified with in-house and contract lab testing, but lacks major independent certifications (USP, NSF)
$0.42/day at 1,200mg (2 capsules) - mid-range pricing
Full label disclosure, clean formulation, form clearly specified
Solid mid-range option from a brand with a strong research focus. Smaller 60-count bottle means you will reorder more frequently.
How We Compared These Products
Every product in our database is scored on four equally-weighted pillars: dosing accuracy and form quality, purity verification (third-party testing), cost per clinically effective dose (not cost per pill), and label transparency. Each pillar is worth 25 points for a total of 100.
Cost per effective dose is calculated using the clinically studied dose from published research, not the manufacturer's suggested serving. If a product requires multiple servings to reach the dose used in clinical trials, that cost is reflected in the value score.
For a full explanation of our scoring methodology, see our methodology page. Prices were last checked on the dates listed for each product and may have changed.
More N-Acetyl Cysteine (NAC) Comparisons
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FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.