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NOW NAC, 1,000 mg supplement bottle
NOW

NAC, 1,000 mg Review

What We Researched
1 active ingredient analyzed · 12 inactive ingredients decoded · 9 brand certifications checked · Page generated: Sep 2026
100
Product Score Excellent
100
Brand Score Excellent

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
N-Acetyl Cysteine (NAC) (1,000 mg) 1 g **
Bioavailability Excellent

Absorption Rating

  • N-Acetyl Cysteine (NAC) (1,000 mg) Good
Other Ingredients Excellent

Fillers & Additives

  • Microcrystalline Cellulose
  • Croscarmellose Sodium
  • Hypromellose
  • Cellulose
  • Sunflower Lecithin
  • Sunflower Oil
  • Hydroxypropyl Cellulose
  • Stearic Acid
  • Triethyl Citrate
  • Vegetarian Coating
  • Silicon Dioxide
  • Vegetable Stearate
Efficacy Excellent

Dosage Analysis

  • N-Acetyl Cysteine (NAC) (1,000 mg) 1 g Effective

Supplement Facts

Ingredient Amount % Daily Value
N-Acetyl Cysteine (NAC) (1,000 mg) 1 g **

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Microcrystalline Cellulose Safe

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

Croscarmellose Sodium Safe

Helps tablets break apart and dissolve quickly in the stomach.

Hypromellose Safe

Forms vegetarian capsule shells. Dissolves easily in the stomach.

Cellulose Safe

Provides bulk and structure in tablets and capsules.

Sunflower Lecithin Safe

Helps mix oil and water-based ingredients. Allergen-free alternative to soy lecithin.

Sunflower Oil Safe

Helps dissolve and absorb fat-soluble vitamins.

Hydroxypropyl Cellulose Safe

Binds tablet ingredients and can form tablet coatings.

Stearic Acid Safe

Helps ingredients flow smoothly through manufacturing equipment.

Triethyl Citrate Generally_safe

It is used as a plasticizer or solvent.

Vegetarian Coating Generally_safe

It is added to coat tablets or capsules.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Vegetable Stearate Safe

Prevents ingredients from sticking to equipment.

Brand Trust Report
NOW

Founded 1968 · Bloomingdale, Illinois, USA · 1759 products · nowfoods.com

Certifications

9 certifications
Informed Sport Source available Primary evidence
Npa Gmp Source available Primary evidence
Consumerlab Source available Primary evidence
Labdoor Source available Primary evidence
Fda Gmp Inspections Source available Primary evidence
Non Gmo Project Source available Primary evidence
Usda Organic Source available Primary evidence
Vegan Certified Source available Primary evidence
Informed Choice Supporting evidence unavailable

Transparency

5 claims
Coa Availability — Verified Evidence available Evidence
Third Party Testing Claim — Verified Evidence available Evidence
Testing Lab Disclosure — Claimed Brand claim; evidence unavailable
In House Testing — Verified Evidence available Evidence

Violation History

8 incidents
Lawsuit Mislabeled St. John's Wort supplement, containing significantly less of the active ingredient than advertised.None Source available Primary source
Lawsuit A data breach that compromised personal and health information of employees and dependents.2023 Source available Primary source
Prop 65 Lead2021-11-30 Source available Primary source
Recall NOW Real Food® Raw Macadamia Nuts2020-06-12 Source available Primary source
Recall NOW Real Food® Raw Macadamia Nuts2020-06-12 Source available Primary source
Recall NOW Real Food® Zesty Sprouting Mix2018-06-21 Source available Primary source
Lawsuit Misleadingly using slack-fill packaging for their Vitamin C supplements.2015 Source available Primary source
Fda Warning Adulterated Dietary Supplement due to pesticide (quintozene) contamination in American Ginseng.2007-10-12 Source available Primary source
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Frequently Asked Questions
Is NOW NAC, 1 a good supplement?

NOW NAC, 1,000 mg 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 12 inactive ingredients (fillers, binders, capsule materials) are rated safe — a clean formulation with no flagged additives. The manufacturer, NOW, holds a brand trust score of 100/100.

What are the ingredients in NOW NAC, 1?

NOW NAC, 1 contains 1 active ingredients: N-Acetyl Cysteine (NAC) (1,000 mg) (1 g). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is NOW NAC, 1 safe to take?

GoodSupp reviewed the inactive-ingredient data available for NOW NAC, 1,000 mg. All 12 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 NOW a trustworthy supplement brand?

NOW 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 1759 products in their lineup. Note: NOW has 8 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 — 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.