NOW NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg supplement bottle
NOW

NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg

What We Researched
3 active ingredients analyzed · 4 inactive ingredients decoded · 5 brand certifications checked · 2 retailers compared · Last updated: Mar 2026
91
Product Score Excellent
89
Brand Score Good

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Zinc 15 mg 136%
N-Acetyl Cysteine 1000 mg
Quercetin 500 mg
Bioavailability Good

Absorption Rating

  • Zinc Fair
  • N-Acetyl Cysteine Good
  • Quercetin Fair
Other Ingredients Excellent

Fillers & Additives

  • Hypromellose
  • Ascorbyl Palmitate
  • Silicon Dioxide
  • Citric Acid
Efficacy Excellent

Dosage Analysis

  • Zinc 15 mg Effective
  • N-Acetyl Cysteine 1000 mg Effective
  • Quercetin 500 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Zinc 15 mg 136%
N-Acetyl Cysteine 1000 mg
Quercetin 500 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Hypromellose Safe

Forms vegetarian capsule shells. Dissolves easily in the stomach.

Ascorbyl Palmitate Safe

Prevents oxidation and extends shelf life of oil-based supplements.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Citric Acid Safe

Adds tartness and acts as a natural preservative. Also aids in ingredient stability.

Price Comparison

Price History

Tracked across major retailers. Updated periodically.

$28$27$26$25$24 $25.99
Target

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

Founded 1968 · Bloomingdale, Illinois, USA · 53 products · nowfoods.com

Certifications

5 certifications
Informed Sport Verified Source
Npa Gmp Verified Source
Fda Gmp Inspections Verified Source
Non Gmo Project Verified Source
Usda Organic Verified Source

Transparency

3 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Claimed
In House Testing — Verified Source
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Frequently Asked Questions
Is NOW NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg a good supplement?

NOW NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg received a product quality score of 91/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 3 active ingredients with 45 servings per container. All 4 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 89/100 with 5 verified certifications including Informed Sport, Npa Gmp, Fda Gmp Inspections, Non Gmo Project.

What are the ingredients in NOW NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg?

NOW NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg contains 3 active ingredients: Zinc (15 mg), N-Acetyl Cysteine (1000 mg), Quercetin (500 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is NOW NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg safe to take?

NOW NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg has been analyzed for ingredient safety across all its components. All 4 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 NOW a trustworthy supplement brand?

NOW receives a brand trust score of 89/100 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 53 products in their lineup. They hold 5 verified certifications including Informed Sport, Npa Gmp, Fda Gmp Inspections, Non Gmo Project. 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.

What is magnesium good for?

Magnesium Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding magnesium good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 250,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

How much magnesium per day?

The optimal dosage depends on your individual health needs, age, sex, and current nutrient levels. Recommended daily amounts are established by health authorities but may vary from therapeutic doses used in clinical research. It's important to check the Supplement Facts label for the exact amount per serving and compare it against the % Daily Value. Some supplements provide mega-doses well above the Daily Value, which may not be necessary and in some cases could be harmful — particularly for fat-soluble vitamins (A, D, E, K) that accumulate in the body. GoodSupp's efficacy analysis evaluates whether a product's dosages align with clinically studied amounts. Always consult your healthcare provider for personalized dosage recommendations.

What is zinc good for?

Zinc Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding zinc good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 250,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

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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.