Muscle + Brawn is independent and reader-supported. When you buy through links on our site, we may earn a commission.

Best NAC Supplements and Brands

With Amazon’s banning of NAC (N-Acetyl Cysteine) supplements, suppliers have been running dry all over and we’ve seen most brands stop selling these products outright. However, we have discovered a few companies that still supply NAC, either in pure powder form or in capsules.

We’re going to keep updating this list with brands as we find them being sold online, but one thing is clear: the government doesn’t want you to have this.
NAC is one of the most popular supplements used for antioxidant support and to reduce inflammation. Here, we’ll review exactly what you need to know about the leading NAC supplements and discuss why they’re far superior to competing brands.

NAC Banned On Amazon

In July 2020, the FDA sent advisory letters to seven supplement brands warning them against selling NAC supplements, even though the FDA has not done a final determination on NAC supplements. However, even though it’s an open issue, Amazon has jumped the gun and banned the sale of all supplements that contain this ingredient.

Don’t worry though! We found the leading retailers that still sell NAC, but be aware that they might sell out at any moment.

TL;DR: What Is The Best NAC Supplement?

  • Bulk Supplements offers the best NAC supplement overall. Its NAC is available in both powder form as well as in gelatin and vegetarian capsules.
  • Double Wood offers the best overall NAC capsules. Each serving (2 capsules) contains 1,000mg of pure NAC.
  • Life Extension offers the best 600mg NAC capsules. This product is easily absorbed and can be taken up to 3 times daily.
  • offers the best NAC powder. This NAC is the purest product we’ve come across and is completely free of adulterants, excipients, and flow agents to maintain purity.
  • Thorne offers the best 500mg NAC capsules.

Comparison of the Best NAC Supplements

Best NAC Supplement
Bulk Supplements
Best NAC Supplements and BrandsBest NAC Supplements and BrandsBest NAC Supplements and BrandsBest NAC Supplements and BrandsBest NAC Supplements and Brands
Best NAC Supplement
Bulk Supplements

This NAC is available in both powder and capsule form.

1 Scoop Daily
600mg per Serving
$0.10 per Serving
Best Large NAC Capsules
Double Wood
Best NAC Supplements and BrandsBest NAC Supplements and BrandsBest NAC Supplements and BrandsBest NAC Supplements and BrandsBest NAC Supplements and Brands
Best Large NAC Capsules
Double Wood

Each capsule contains 500mg of NAC, but the recommended daily serving is 2 capsules (1,000mg).

2 Capsules Daily
1000mg per Serving
$0.19 per Serving
Best Small NAC Capsules
Life Extension
Best NAC Supplements and BrandsBest NAC Supplements and BrandsBest NAC Supplements and BrandsBest NAC Supplements and BrandsBest NAC Supplements and Brands
Best Small NAC Capsules
Life Extension

This easily-absorbed, capsule version of NAC contains 600 mg per serving.

1-3 Capsules Daily
600mg per Serving
$0.18 per Serving
Best NAC Powder
Best NAC Supplements and BrandsBest NAC Supplements and BrandsBest NAC Supplements and BrandsBest NAC Supplements and BrandsBest NAC Supplements and Brands
Best NAC Powder

This is the purest NAC powder available, with each batch possessing a minimum purity of 98%.

Weigh with Scale
1000mg per Serving
$0.15 per Serving

Best Value NAC Supplement: Bulk Supplements (Back in Stock)

Best NAC Supplements

Bulk Supplements offers the best NAC capsules available. It provides customers with the option to select from standard gelatin capsules or vegetarian-friendly capsules and there is also a powder version available as well.

This product contains pure N-Acetyl L-Cysteine that is free of additional ingredients or additives of any kind. Customers can order either 100 or 300 capsules of NAC or may choose to purchase it in powder form of varying quantities as well.

It is recommended for adults to take 1-3 servings of 600mg daily, depending on their health needs.

  • Capsule or powder form

  • Gelatin or vegetarian capsules

  • 100% pure NAC

  • Vegetarian capsules sell out often and may have limited availability 

custom multivitamin pack

Best and Largest NAC Capsules – Double Wood

Best NAC

Double Wood offers one of the most potent NAC supplements available today.  Each capsule contains 500mg of NAC, but the recommended daily serving is 2 capsules (1,000mg).

Thankfully, Double Wood’s NAC capsules are made with naturally derived ingredients only and are free from synthetic materials that are often contained in lower-quality, generic products.

Whether you’re new to using NAC or have used it for a while, this product can be easily dosed according to one’s preferences and tolerability.

  • 2 capsules daily
  • 1000mg of NAC per serving
  • 100% pure NAC

  • Some people may require 4 capsules daily for certain conditions

  • Powder version is more cost-effective

  • Some people prefer to avoid the use of MCC (microcrystalline cellulose)

Best Smaller NAC Capsules – Life Extension

Best NAC Supplements

NAC by Life Extension is available in an easily absorbed, capsule form that provides 600mg of N-Acetyl-L-Cysteine per serving.

This is the perfect product for customers who can’t stand the somewhat bitter taste of NAC in its standard powder form as it doesn’t leave an aftertaste whatsoever.

Additionally, there’s no hassle with having to measure out dosages exactly and this product provides an easy way to gradually increase or lower servings as needed.

This 100% pure NAC supplement provides systemic benefits, especially for bronchial, respiratory, liver, and immune health.

It is recommended for adults to take 1-3 capsules daily.

  • Easy to take capsules
  • 600mg of NAC per serving
  • 100% pure NAC

  • Powder version is less expensive per serving than capsules

Best Alternative NAC Powder:

Best NAC offers the purest NAC powder available, with each batch possessing a minimum purity of 98%. Additionally, the company provides batch purity reports for all of its products.

Not only is this NAC the purest but it’s also contained in a PET single-wall jar with UV resistance to minimize degradation and is protected by a tamper-proof seal to reduce the risk of damage during shipping.

Each container holds 100grams of NAC powder, which provides 100 servings for customers who use 1,000mg per day.

  • Pure powder form

  • 100 servings per container

  • Purest NAC available

  • Some customers may not enjoy the taste

  • There are no directions for serving sizes as this product is intended for research purposes only

  • You will need to purchase a serving spoon separately and carefully weigh each dose with a scale

NAC Antioxidant

NAC exhibits extremely powerful antioxidant properties due to its ability to enhance glutathione production, promote full-body detoxification, and remove free radicals. [1]

Its role as an antioxidant allows it to be an effective option in the treatment of disorders that result directly from free oxygen radical formation and damage. Some of the most common disorders that are caused or heavily affected by free radical damage include infertility in men and PCOS in women.

Men and women affected by these disorders who have used NAC in conjunction with standard forms of treatment have displayed incredible improvements in fertility parameters, such as sperm morphology and function, and have improved women’s chances of conceiving due to improvements in ovulation. [5]

Additionally, NAC has provided substantial support for diabetics in the prevention of further complications related to oxidative stress. Studies have shown that NAC reduces the risk of myocardial infarction in those who suffer from diabetes and may play a critical role in the prevention of both ischemia and non-ischemic-associated cardiac damage. [3]

Best Time to Take NAC

NAC can be taken throughout the day as needed. However, it is generally recommended to take NAC after eating to prevent potential side effects such as nausea or gastrointestinal discomfort.

Most people take their first dose of NAC upon waking with breakfast and take additional servings as needed, such as mid-day or before bed.

custom multivitamin pack

Best NAC for Anxiety?

NAC has been used for the treatment of anxiety, depression, and similar disorders. [2]  NAC is successful in the treatment of psychiatric and neurological disorders due to its role in reducing cellular damage related to oxidative stress and inflammation, its ability to prevent apoptosis, and its assistance in mitochondrial function and dopamine regulation. [4]

Studies have displayed that servings of 2,400-3,000 mg/day of NAC used over the course of at least 3 months help to drastically reduce the severity of the most common symptoms associated with mental health disorders. [6]

NAC provides people of all ages with an over-the-counter, affordable form of treatment that is easily accessible and poses minimal adverse effects. As far as what the best is? Just get pure.

Best NAC Supplement

We recommend N-Acetyl L-Cysteine (NAC) by Bulk Supplements as the best NAC supplement. Bulk goes above and beyond in offering its customers numerous options for how to take their NAC and its products are incredibly pure and affordable when compared to other leading brands.

The company offers both powder and capsule form for its NAC and it also provides both gelatin and vegetarian options for its capsules. They’re also the most affordable option!

Take-Home Message

If you’re looking for the best NAC capsules, we highly recommend taking pure NAC by Bulk Supplements.


See all references

[1] Mokhtari, V., Afsharian, P., Shahhoseini, M., Kalantar, S. M., & Moini, A. (2017). A Review on Various Uses of N-Acetyl Cysteine. Cell journal, 19(1), 11–17.

[2] Rapado-Castro, M., Dodd, S., Bush, A. I., Malhi, G. S., Skvarc, D. R., On, Z. X., … & Dean, O. M. (2017). Cognitive effects of adjunctive N-acetyl cysteine in psychosis.

[3] Dludla, P. V., Dias, S. C., Obonye, N., Johnson, R., Louw, J., & Nkambule, B. B. (2018). A systematic review on the protective effect of N-acetyl cysteine against diabetes-associated cardiovascular complications. American Journal of Cardiovascular Drugs, 18(4), 283-298.

[4] Oliver, G., Dean, O., Camfield, D., Blair-West, S., Ng, C., Berk, M., & Sarris, J. (2015). N-acetyl cysteine in the treatment of obsessive compulsive and related disorders: a systematic review. Clinical psychopharmacology and neuroscience : the official scientific journal of the Korean College of Neuropsychopharmacology, 13(1), 12–24.

[5] Jannatifar, R., Parivar, K., Roodbari, N. H., & Nasr-Esfahani, M. H. (2019). Effects of N-acetyl-cysteine supplementation on sperm quality, chromatin integrity and level of oxidative stress in infertile men. Reproductive Biology and Endocrinology, 17(1), 1-9.

[6] Slattery, J., Kumar, N., Delhey, L., Berk, M., Dean, O., Spielholz, C., & Frye, R. (2015). Clinical trials of N-acetylcysteine in psychiatry and neurology: a systematic review. Neuroscience & Biobehavioral Reviews, 55, 294-321.

[7] Fernandes, B. S., Dean, O. M., Dodd, S., Malhi, G. S., & Berk, M. (2016). N-Acetylcysteine in depressive symptoms and functionality: a systematic review and meta-analysis. The Journal of clinical psychiatry, 77(4), 457-466.

Learn More On This Subject..

Kathryn Giuffrida MPH

Kathryn Giuffrida MPH

Kathryn obtained a MPH in Toxicology & Risk Assessment from the University of South Florida in 2018. She's also a year-round swimmer who qualified to compete in the 2020 TYR Pro Series.

Leave a Reply

Your email address will not be published. Required fields are marked *

Best NAC Supplement

Learn The Secret Shit.

Get notified when we release new guides on hormones, SARMs, cycles, and reviews. 100% spam Free.