Product Reviews
N-Acetyl Cysteine Supplements Review

Initial Posting: 9/26/14  Last Update: 12/4/17 
N-acetyl cysteine (NAC) supplements tested by

Choose the Best N-Acetyl Cysteine Supplement

Find Out Which NAC Supplements Provide Best Quality and Value

Alphabetical list of the NAC supplement brands compared in this review:
Bluebonnet NAC NutriCology NAC Source Naturals N-Acetyl Cysteine
Carlson NAC PharmaNAC Twinlab NAC Fuel
Doctor's Best Best NAC Detox Regulators Pure Encapsulations NAC Vitamin Shoppe NAC
KAL NAC+ Puritan's Pride NAC Vitamin World NAC
Nature's Sunshine N-Acetyl Cysteine Solgar NAC Whole Foods NAC
Bluebonnet NAC Carlson NAC Doctor's Best Best NAC Detox Regulators KAL NAC+ Nature's Sunshine N-Acetyl Cysteine NutriCology NAC PharmaNAC Pure Encapsulations NAC Puritan's Pride NAC Solgar NAC Source Naturals N-Acetyl Cysteine Twinlab NAC Fuel Vitamin Shoppe NAC Whole Foods NAC
Find the right NAC supplement for you, at the right price! Isn't your health worth it?
NAC (N-acetyl cysteine) is a supplement which the body converts into glutathione, an important antioxidant. Supplementation may be helpful for reducing symptoms of the flu and flare-ups of chronic bronchitis and COPD. NAC may also be beneficial in Sjogren's syndrome, renal failure, schizophrenia, compulsive behavior, and polycystic ovary disease. 

We independently and rigorously tested the quality 
of many popular NAC supplements on the market. Among the products that passed testing, the cost to obtain an equivalent dose of NAC ranged from just 9 cents to 70 cents -- meaning that you can save a lot by shopping wisely. Some products contain added ingredients, but it may not be worth paying more for these. We also found that the daily suggested dose ranged just 500 mg to 1,800 mg, so it's critical that you know how much you really need rather than rely on labels.  

You must be a member to get the full test results for
NAC supplements along with's recommendations and quality ratings. You'll get results for ten NAC supplements selected by and for four others that passed the same testing through CL's voluntary certification program, as well as information about another product very similar to one of those that passed testing. 

In this comprehensive review, you'll discover:
    • Which NAC supplements passed or failed our tests
    • Which of the best NAC supplements provide the greatest value, i.e., high-quality NAC at lowest cost
    • Why additional ingredients are sometimes added to NAC supplements and whether they matter
    • What "free form" NAC means and whether it's important to look for it on labels
    • Dosage of NAC for specific uses — as well as the evidence for or against these uses 
    • Concerns, cautions, and potential side effects with NAC

If you already are a member, SIGN IN now.

Learn More About Finding the Best N-Acetyl Cysteine Supplements Answers -- for N-Acetyl Cysteine Supplements Review
If I buy NAC as a loose powder in a large bag, as opposed to in tablet form, will it spoil? I've heard it can spoil or degrade into a harmful by-product. Get the answer >>

Is it true that NAC can help clear nasal passages? Get the answer >>

Which supplements reduce the risk of stroke? Which increase the risk of stroke? Get the answer >>

Do glutathione supplements work to prevent aging or for other conditions? Get the answer >>

Which supplements can help treat constipation? Get the answer >>

Which supplements can cause diarrhea? Get the answer >>

Can taking NAC (N-acetylcysteine) interfere with blood tests? Get the answer >>

Which supplements can cause constipation? Get the answer >>
Join |  Sign In
Join Us on Facebook! Join Us on Instagram! Join Us on Twitter! Join Us on YouTube! Join Us on YouTube!
Product Tests
Brands Tested
Health Conditions
CL Answers
Clinical Updates
Recalls & Warnings
Where to Buy Products
Raw Materials Tests
Testing Program
How Products Were Tested
Join CL Today
Join Free Newsletter
Group Subscriptions
Gift Membership
About Us
The CL Seal
CL Survey
Privacy Policy
Contact Us/Help

©2019, LLC. All rights reserved. A single copy of a report may be printed for personal use by the subscriber. It is otherwise unlawful to print, download, store or distribute content from this site without permission. name and flask logo are both registered trademarks of, LLC. This site is intended for informational purposes only and not to provide medical advice.