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N-acetyl cysteine (NAC) supplements tested by ConsumerLab.comProduct Reviews

N-Acetyl Cysteine Supplements Review

Choose the Best N-Acetyl Cysteine Supplement

Find Out Which NAC Supplements Provide Best Quality and Value

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Brands compared in report

Bluebonnet NAC
Carlson NAC
Doctor’s Best Best NAC Detox Regulators
Nature's Sunshine N-Acetyl Cysteine
NutriCology NAC
Pure Encapsulations NAC
Puritan's Pride NAC
Solgar NAC
Source Naturals N-Acetyl Cysteine
Twinlab NAC Fuel
Vitamin Shoppe NAC
Vitamin World NAC
Whole Foods NAC

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More about this report

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

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