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Twinlab NAC (N-Acetyl-Cysteine) supplement bottle
Twinlab

NAC (N-Acetyl-Cysteine) Review

What We Researched
1 active ingredient analyzed · 4 inactive ingredients decoded · 2 brand certifications checked · Page generated: Sep 2026
100
Product Score Excellent
75
Brand Score Fair

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
NAC 600 mg †
Bioavailability Excellent

Absorption Rating

  • NAC Good
Other Ingredients Excellent

Fillers & Additives

  • Gelatin
  • Medium Chain Triglycerides
  • Silica
  • Magnesium Stearate
Efficacy Excellent

Dosage Analysis

  • NAC 600 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
NAC 600 mg †

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Gelatin Safe

Forms the capsule shell that holds the supplement contents.

Medium Chain Triglycerides Safe

Enhances absorption of fat-soluble vitamins.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Brand Trust Report
Twinlab

Founded 1968 · Boca Raton, Florida, USA · 65 products · twinlab.com

Certifications

2 certifications
Consumerlab Source available Primary evidence
NSF Certified Supporting evidence unavailable

Transparency

4 claims
Third Party Testing Claim — Claimed Evidence available Evidence
In House Testing — Claimed Evidence available Evidence
Testing Lab Disclosure — True Brand claim; evidence unavailable

Violation History

1 incident
Lawsuit Securities fraud, making false and misleading statements, and overstating inventory.2001 Source available Primary source
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Frequently Asked Questions
Is Twinlab NAC (N-Acetyl-Cysteine) a good supplement?

Twinlab NAC (N-Acetyl-Cysteine) received a product quality score of 100/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 1 active ingredients All 4 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, Twinlab, holds a brand trust score of 75/100.

What are the ingredients in Twinlab NAC (N-Acetyl-Cysteine)?

Twinlab NAC (N-Acetyl-Cysteine) contains 1 active ingredients: NAC (600 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Twinlab NAC (N-Acetyl-Cysteine) safe to take?

GoodSupp reviewed the inactive-ingredient data available for Twinlab NAC (N-Acetyl-Cysteine). All 4 inactive ingredients — including capsule materials, fillers, and binders — are currently classified as safe in GoodSupp's ingredient reference data. This label analysis cannot determine whether the product is safe for a particular person, and source labels may change. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Twinlab a trustworthy supplement brand?

Twinlab receives a brand trust score of 75/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1968 and headquartered in Boca Raton, Florida, USA, the company offers 65 products in their lineup. Note: Twinlab has 1 historical regulatory incident on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records — read our methodology. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.