GNC N-Acetyl-L-Cysteine NAC 600mg - 120 Vegetarian Capsules (120 Servings) supplement bottle
GNC

N-Acetyl-L-Cysteine NAC 600mg - 120 Vegetarian Capsules (120 Servings)

What We Researched
1 active ingredient analyzed · 5 inactive ingredients decoded · 5 brand certifications checked · 1 retailer compared · Last updated: Mar 2026
100
Product Score Excellent
88
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
N-Acetyl L-Cysteine 600 mg
Bioavailability Excellent

Absorption Rating

  • N-Acetyl L-Cysteine Good
Other Ingredients Excellent

Fillers & Additives

  • Hydroxypropyl Methylcellulose
  • Microcrystalline Cellulose
  • Magnesium Stearate
  • Silicon Dioxide
  • Sodium Chloride
Efficacy Excellent

Dosage Analysis

  • N-Acetyl L-Cysteine 600 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
N-Acetyl L-Cysteine 600 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Hydroxypropyl Methylcellulose Safe

It is used as a coating for tablets and capsules.

Microcrystalline Cellulose Safe

Adds bulk to small-dose supplements to make tablets/capsules a manageable size.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Sodium Chloride Safe

Provides sodium, stabilizes formulations.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$27$26$25$24$23 Mar 12 $24.99
GNC

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
GNC

Founded 1935 · Pittsburgh, Pennsylvania, USA · 200 products · gnc.com

Certifications

5 certifications
Informed Sport Verified Source
Consumerlab Verified Source
Fda Gmp Inspections Verified Source
Usda Organic Verified Source
Vegan Certified Verified Source

Transparency

3 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Verified Source
In House Testing — Claimed
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Frequently Asked Questions
Is GNC N-Acetyl-L-Cysteine NAC 600mg - 120 Vegetarian Capsules (120 Servings) a good supplement?

GNC N-Acetyl-L-Cysteine NAC 600mg - 120 Vegetarian Capsules (120 Servings) 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 with 120 servings per container. All 5 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, GNC, holds a brand trust score of 88/100 with 5 verified certifications including Informed Sport, Consumerlab, Fda Gmp Inspections, Usda Organic.

What are the ingredients in GNC N-Acetyl-L-Cysteine NAC 600mg - 120 Vegetarian Capsules (120 Servings)?

GNC N-Acetyl-L-Cysteine NAC 600mg - 120 Vegetarian Capsules (120 Servings) contains 1 active ingredients: N-Acetyl L-Cysteine (600 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is GNC N-Acetyl-L-Cysteine NAC 600mg - 120 Vegetarian Capsules (120 Servings) safe to take?

GNC N-Acetyl-L-Cysteine NAC 600mg - 120 Vegetarian Capsules (120 Servings) has been analyzed for ingredient safety across all its components. All 5 inactive ingredients — including capsule materials, fillers, and binders — are rated safe based on regulatory data and published safety research. This is a clean formulation with no controversial additives. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is GNC a trustworthy supplement brand?

GNC receives a brand trust score of 88/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1935 and headquartered in Pittsburgh, Pennsylvania, USA, the company offers 200 products in their lineup. They hold 5 verified certifications including Informed Sport, Consumerlab, Fda Gmp Inspections, Usda Organic. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. No regulatory violations or FDA warning letters were found in our research.

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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. 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.