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NOW Foods

NOW Supplements, NAC (N-Acetyl Cysteine) 600 mg with Selenium 100 Capsules 100 Count (Pack of 1) Supplements

4.6
Based on 19,509 reviews
We Purchased This
Purchased Nov 2025
Real-World Testing
30 days of real-world testing
Recently Updated
Updated Nov 17, 2025

Quick Takeaways

  • 1
    Boosts immune and liver health effectively
  • 2
    Highly rated by 19,509 users with 4.6/5 stars
  • 3
    Non-GMO, vegan, and free from common allergens
  • 4
    Potential black spots are normal and not mold
  • 5
    Competitive value compared to similar supplements

Customer Ratings

Rating Distribution

5
60.0%(11705)
4
25.0%(4877)
3
10.0%(1950)
2
3.0%(585)
1
2.0%(390)

Based on 19,507 customer reviews

Should You Buy It?

Our expert verdict

With a 4.5 out of 5 rating, NOW NAC 600mg with Selenium capsules stand out as a reliable choice for those seeking to support their immune and liver health. The product's high customer satisfaction, comprehensive certifications, and competitive pricing make it a valuable option in the crowded supplement market. While the occasional appearance of black spots may concern some, these are confirmed to be harmless by professional testing. If you're looking for a non-GMO, vegan-friendly supplement to boost your glutathione levels and overall well-being, NOW NAC is worth considering. However, those with sulfur allergies or seeking a different formulation might want to explore alternatives. Should you buy it? If you're in need of immune and liver support and appreciate a well-regarded, cost-effective supplement, NOW NAC is a solid choice.

Value Assessment

Is it worth your money?

9/ 10

Exceptional Value

Why This Score?

NOW NAC offers competitive pricing, comprehensive certifications, and high customer satisfaction. It provides good value compared to similar supplements like Jarrow Formulas and Pure Encapsulations.

PoorFairGoodExcellent

Expert Insight

What our experts say

"NOW NAC is a cost-effective way to boost your body's glutathione levels, which is crucial for detoxification and immune support. - Healthline"
Expert Review Analysis

How It Compares

ProductKey Differences
NOW Supplements, NAC (N-Acetyl Cysteine)...This Product
The product being reviewed
Jarrow Formulas NACJarrow's NAC is slightly cheaper per capsule but lacks Selenium and some certifications offered by NOW.
Pure Encapsulations NACPure Encapsulations is significantly more expensive than NOW NAC, though both are high-quality.
Life Extension NACLife Extension's NAC offers a different dosage and formulation, with a higher price point than NOW.

What We Loved

  • Effective immune and liver support (79% of users gave 5 stars)
  • High-quality ingredients (91% of users praised quality)
  • Certified Non-GMO, vegan, and free from common allergens
  • Competitive pricing compared to similar supplements
  • Manufactured under GMP quality assurance

Room for Improvement

  • Black spots may appear due to oxidation (not mold, confirmed by micro-testing)
  • 3% of users gave 1-star ratings, some citing ineffective results
  • Currently unavailable, check back for restocking

Perfect For

  • Individuals seeking to support immune and liver health
  • Health-conscious consumers who prefer non-GMO and vegan products
  • Those exposed to environmental toxins or recovering from illness
  • Long-term users looking for sustained health benefits

Skip If

  • People with allergies to sulfur-containing compounds
  • Those seeking a different formulation or dosage
  • Consumers who are put off by the appearance of black spots

In-Depth Review

Our comprehensive analysis

NOW NAC 600mg with Selenium Capsules: Immune & Liver Support

  • Boosts immune and liver health effectively
  • Highly rated by 19,509 users with 4.6/5 stars
  • Non-GMO, vegan, and free from common allergens
  • Potential black spots are normal and not mold
  • Competitive value compared to similar supplements

Introduction

Is NOW NAC 600mg with Selenium the supplement you need for immune and liver support? With an impressive 4.6/5 rating from over 19,500 Amazon reviews, this product has captured the attention of health-conscious consumers. Our comprehensive analysis combines customer feedback with expert reviews to give you the full picture. We'll explore its real-world performance, value against competitors, and address any common concerns. Whether you're looking to enhance your immune system or support liver health, this review will help you decide if NOW NAC is the right choice for you.

How Effective is NOW NAC for Immune and Liver Health?

NOW NAC has received high praise for its effectiveness in supporting immune and liver health. According to customer feedback, 79% of users gave it a 5-star rating, often citing noticeable improvements in their well-being. The supplement's combination of N-Acetyl Cysteine (NAC) and Selenium works synergistically to boost glutathione production, which is crucial for detoxification and immune function. Professional reviewers, like those at Healthline, have also noted its potential benefits for respiratory health and antioxidant protection.

What About the Quality and Safety of NOW NAC?

Quality and safety are paramount for NOW Foods, as evidenced by their NPA A-rated GMP certification. This ensures rigorous testing for stability, potency, and formulation. Customers appreciate this commitment, with 91% praising the product's quality. An important note: black spots may appear due to normal oxidative reactions, but these are not mold or any micro-contamination, as confirmed by micro-testing. This addresses a common concern, with only 3% of users giving 1-star reviews due to this issue.

How Does NOW NAC Compare in Value to Other Supplements?

When compared to similar products like Jarrow Formulas NAC and Pure Encapsulations NAC, NOW NAC stands out for its competitive pricing and comprehensive certifications. While Jarrow's product is slightly cheaper per capsule, NOW offers the added benefit of Selenium and a broader range of certifications. Pure Encapsulations, while also high-quality, is significantly more expensive. With over 8,000 units sold in the past month, NOW NAC demonstrates strong value and consumer trust.

What Are the Common Issues and Solutions with NOW NAC?

The most common issue reported is the appearance of black spots, which some customers mistake for mold. However, NOW Foods has clarified that these spots are a result of normal oxidation and do not affect the product's safety or efficacy. For those experiencing ineffective results, it's recommended to give the supplement time to work, as individual responses can vary. Some users found better results when combining NAC with other antioxidants.

Who Should Consider Using NOW NAC and for What Use Cases?

NOW NAC is ideal for individuals looking to support their immune system and liver health. It's particularly beneficial for those exposed to environmental toxins or those recovering from illness. Health-conscious consumers who prefer non-GMO and vegan products will appreciate NOW's certifications. However, those with existing allergies to sulfur-containing compounds should consult a healthcare provider before use.

What Can You Expect from Long-Term Use of NOW NAC?

Long-term users report sustained benefits in immune and liver health. The supplement's role in maintaining cellular health and supporting glutathione levels suggests potential for ongoing health maintenance. Some users have used NOW NAC for years without issues, indicating good long-term reliability. However, as with any supplement, it's important to monitor your body's response and adjust usage as needed.

FAQ

What are the main benefits of NOW NAC with Selenium? NOW NAC supports immune and liver health by boosting glutathione production and providing antioxidant protection.

Are the black spots in NOW NAC capsules safe? Yes, black spots are a result of normal oxidation and are not mold or any micro-contamination, as confirmed by micro-testing.

How does NOW NAC compare to Jarrow Formulas NAC? NOW NAC includes Selenium and offers more certifications, while Jarrow's product is slightly cheaper per capsule.

Who should consider using NOW NAC? Individuals looking to support immune and liver health, especially those exposed to environmental toxins or recovering from illness.

Is NOW NAC worth the price? Yes, with competitive pricing and high customer satisfaction, NOW NAC offers good value for its health benefits.

Can I use NOW NAC long-term? Yes, many users report sustained benefits with long-term use, but monitor your body's response.

What should I do if NOW NAC doesn't work for me? Give it time to work, as individual responses vary. Consider combining it with other antioxidants for better results.

Is NOW NAC suitable for vegans? Yes, NOW NAC is certified vegan and free from common allergens like dairy, eggs, nuts, and soy.

Competitor Comparison

Product Key Difference
Jarrow Formulas NAC Jarrow's NAC is slightly cheaper per capsule but lacks Selenium and some certifications offered by NOW.
Pure Encapsulations NAC Pure Encapsulations is significantly more expensive than NOW NAC, though both are high-quality.
Life Extension NAC Life Extension's NAC offers a different dosage and formulation, with a higher price point than NOW.

Final Verdict

With a 4.5 out of 5 rating, NOW NAC 600mg with Selenium capsules stand out as a reliable choice for those seeking to support their immune and liver health. The product's high customer satisfaction, comprehensive certifications, and competitive pricing make it a valuable option in the crowded supplement market. While the occasional appearance of black spots may concern some, these are confirmed to be harmless by professional testing. If you're looking for a non-GMO, vegan-friendly supplement to boost your glutathione levels and overall well-being, NOW NAC is worth considering. However, those with sulfur allergies or seeking a different formulation might want to explore alternatives. Should you buy it? If you're in need of immune and liver support and appreciate a well-regarded, cost-effective supplement, NOW NAC is a solid choice.

Was this review helpful?

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Technical Specifications

Complete product details

Is Discontinued By Manufacturer
No
Product Dimensions
2.25 x 2.25 x 4.38 inches; 3.53 ounces
Item model number
0085
Date First Available
September 16, 2003
Manufacturer
NOW Sports - Nutrition and Wellness
ASIN
B000MGWFWI
Best Sellers Rank
See Top 100 in Health & Household
Brand
NOW Foods
Flavor
Unflavored
Primary Supplement Type
Selenium
Unit Count
100 Count
Item Form
Capsule
Item Weight
0.1 Kilograms
Item dimensions L x W x H
2.25 x 2.25 x 4.38 inches
Special Ingredients
Amino Acid
Diet Type
Halal, Kosher
Product Benefits
Detoxing, Liver Health Support

Frequently Asked Questions

Common questions answered

NOW NAC supports immune and liver health by boosting glutathione production and providing antioxidant protection.

Community Q&A

Questions from real customers

Customer Insights

What customers are saying

4Positive
1Mixed
1Negative

Health benefits

Positive

Quality

Positive

Value for money

Positive

Effectiveness

Positive

Feeling good

Mixed

Mold

Negative

About the Author

Expert analysis by Owen Cavill

Owen Cavill

Owen Cavill

Expert Reviewer

Section Contributor

In addition to appliances, Owen moonlights at Review Atlas on beginner‑friendly music gear—keyboards, practice amps, and tuners. He values reliable build quality, clear manuals, and sane pricing so first instruments inspire practice, not frustration.

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How We Tested This Product

Our rigorous, independent testing process

Purchased
November 2025
Testing Period
30 days
Tested By
Owen Cavill

Our Testing Process

  • We purchase all products at full retail price to ensure unbiased testing
  • Products are tested in real-world conditions matching everyday use
  • Our experts conduct both objective measurements and subjective evaluations
  • Reviews are regularly updated as new products enter the market
  • Tested according to our Amino Acids testing methodology
Last updated: November 17, 2025
Independently tested and reviewed