NOW

NAC, 1,000 mg Review

Name: NOW NAC, 1,000 mg Review
Item: NAC, 1,000 mg
Author: GoodSupp

What We Researched

1 active ingredient analyzed · 12 inactive ingredients decoded · 9 brand certifications checked · Last updated: Aug 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

Ingredient	Amount	% 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

Certifications

9 certifications

Informed Sport Verified Source

Npa Gmp Verified Source

Consumerlab Verified Source

Labdoor Verified Source

Fda Gmp Inspections Verified Source

Non Gmo Project Verified Source

Usda Organic Verified Source

Vegan Certified Verified Source

Informed Choice Verified

Transparency

5 claims

Coa Availability — Verified Source

Third Party Testing Claim — Verified Source

Testing Lab Disclosure — Claimed

In House Testing — Verified Source

Violation History

8 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 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 Of the 12 inactive ingredients, 10 are rated safe and 0 are flagged for review. The manufacturer, NOW, holds a brand trust score of 100/100 with 9 verified certifications including Informed Sport, Npa Gmp, Consumerlab, Labdoor.

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?

NOW NAC, 1,000 mg 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 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. They hold 9 verified certifications including Informed Sport, Npa Gmp, Consumerlab, Labdoor. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. 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.