NOW Foods NAC, 600 mg, 250 Capsules supplement bottle
NOW Foods

NAC, 600 mg, 250 Capsules

What We Researched
2 active ingredients analyzed · 3 inactive ingredients decoded · 7 brand certifications checked · 3 retailers compared · Last updated: Mar 2026
87
Product Score Good
100
Brand Score Excellent

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Selenium (elemental) (from 5 mg L-Selenomethionine) 25 mcg 45%
N-Acetyl Cysteine (NAC) 600 mg †
Bioavailability Excellent

Absorption Rating

  • Selenium (elemental) (from 5 mg L-Selenomethionine) Good
  • N-Acetyl Cysteine (NAC) Good
Other Ingredients Excellent

Fillers & Additives

  • Hypromellose (Cellulose Capsule)
  • Stearic Acid (Vegetable Source)
  • Citric acid and microcrystalline cellulose
Efficacy Fair

Dosage Analysis

  • Selenium (elemental) (from 5 mg L-Selenomethionine) 25 mcg Under-dosed
  • N-Acetyl Cysteine (NAC) 600 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Selenium (elemental) (from 5 mg L-Selenomethionine) 25 mcg 45%
N-Acetyl Cysteine (NAC) 600 mg †

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Hypromellose (Cellulose Capsule) Safe

It is used as a material for making vegetarian capsules.

Stearic Acid (Vegetable Source) Generally_safe

It is used as a lubricant and release agent.

Citric acid and microcrystalline cellulose Unknown

Price Comparison

iHerb $29.39
Best Price
Target $30.99

Price History

Tracked across major retailers. Updated periodically.

$31$30$29$28$27 Mar 12 $29.39
iHerb

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

Brand Trust Report
NOW Foods

Founded 1968 · Bloomingdale, Illinois, USA · 996 products · nowfoods.com

Certifications

7 certifications
Consumerlab Verified Source
Informed Sport Verified Source
Labdoor Verified Source
Non Gmo Project Verified Source
Npa Gmp Verified Source
Usda Organic Verified Source
Fda Gmp Inspections Verified Source

Transparency

5 claims
Third Party Testing Claim — Verified Source
Coa Availability — Verified Source
Testing Lab Disclosure — Verified Source
In House Testing — Verified Source

Violation History

7 incidents
Lawsuit Mislabeled St. John's Wort supplement, containing significantly less of the active ingredient than advertised.NoneSource
Lawsuit A data breach that compromised personal and health information of employees and dependents.2023Source
Prop 65 Lead2021-11-30Source
Recall NOW Real Food® Raw Macadamia Nuts2020-06-12Source
Recall NOW Real Food® Zesty Sprouting Mix2018-06-21Source
Lawsuit Misleadingly using slack-fill packaging for their Vitamin C supplements.2015Source
Fda Warning Adulterated Dietary Supplement due to pesticide (quintozene) contamination in American Ginseng.2007-10-12Source
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Frequently Asked Questions
Is NOW Foods NAC, 600 mg a good supplement?

NOW Foods NAC, 600 mg, 250 Capsules received a product quality score of 87/100 in GoodSupp's independent analysis, indicating strong overall quality. The product contains 2 active ingredients Of the 3 inactive ingredients, 1 are rated safe and 0 are flagged for review. The manufacturer, NOW Foods, holds a brand trust score of 100/100 with 7 verified certifications including Consumerlab, Informed Sport, Labdoor, Non Gmo Project.

What are the ingredients in NOW Foods NAC, 600 mg?

NOW Foods NAC, 600 mg contains 2 active ingredients: Selenium (elemental) (from 5 mg L-Selenomethionine) (25 mcg), N-Acetyl Cysteine (NAC) (600 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is NOW Foods NAC, 600 mg safe to take?

NOW Foods NAC, 600 mg, 250 Capsules has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is NOW Foods a trustworthy supplement brand?

NOW Foods receives a brand trust score of 100/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1968 and headquartered in Bloomingdale, Illinois, USA, the company offers 996 products in their lineup. They hold 7 verified certifications including Consumerlab, Informed Sport, Labdoor, Non Gmo Project. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: NOW Foods has 7 historical regulatory incidents 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. 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.