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2018's 10 Best
NAC Supplements

There aren’t very many supplements on the market today that are widely accepted as aids for your liver. NAC is one of those few exceptions. It’s backing in the scientific community is unparalleled.

NAC is short for N-Acetylcysteine. It is a modified version of the amino acid, cysteine. NAC has a big impact on the way the cells in your body function. Its most widely-acknowledged health benefits are for your liver.

These benefits include:

  • Revitalization of liver after long-term degradation
  • Reversal of acute liver failure caused by acetaminophen overdose.

NAC is a precursor to the antioxidant, glutathione. Glutathione is produced in the liver to handle toxins throughout the body. Glutathione deficiencies are common with people who use alcohol or Tylenol regularly. While it is primarily prescribed for adults at risk of liver failure, there are other great benefits.

It is currently being considered as a treatment option for:

  • immune health
  • addiction recovery
  • Polycystic Ovary Syndrome (PCOS)
  • neurological conditions such as OCD.

These benefits are still under strict scientific consideration. When weighing options for potential natural remedies, though, NAC is a great supplement to consider.

The benefits of prescribed use are scientifically-backed and far-reaching. There are very few side effects that have been found as a result of taking NAC at prescribed doses. This means that in case NAC isn’t effective at treating your condition, you aren’t at risk. (1)

If you’re an adult looking for options or you want to provide your body a better support system, keep reading.

Or, if you’ve already decided you want to try this supplement, you can click here to try one of our Top 10 NAC supplements.

What is NAC?

NAC is a form of cysteine, a sulfurous essential amino acid. It is the precursor to the metabolic process that creates glutathione. Glutathione is an antioxidant created in the liver to promote toxin removal.

NAC is considered a treatment option for issues caused by cell degradation. When dealing with liver toxicity, NAC’s primary role is to promote the production of antioxidants. These can fight cell-killing toxins. This is why the public commonly sees NAC getting used to lessen the effects of acetaminophen overdoses.

But these processes are also attributed to the treatment of psychiatric syndromes and disorders like:

  • bipolar disorder
  • OCD
  • schizophrenia.

This is still being heavily studied by physicians. As such, the dosage of NAC that is currently available through the use of a supplement will not likely have a definitive impact.

The reason that NAC has been shown to have such capabilities is the metabolic contribution to glutathione creation and how it impacts general cell moderation. It can change the way cells react with each other to improve their function and capability.

NAC works by regulating gene expression in several processes across your body. It manages the inflammatory processes caused by infections. It also lessens oxidative damage caused by free radicals and helps boost cell protection against outside forces. This reduces the chance of harmful free radical production as well as any oxidative damage that can be caused by them.

If you have noticed changes in your health, NAC might be the answer. Because of its sulfurous, antioxidant, and amino acid properties, its benefits reach farther than your liver. Click here to try one of our Top 10 NAC supplements.

Benefits of N-acetylcysteine

NAC for Liver and Kidney Support

These are the key forms of usage for NAC. Glutathione is the primary antioxidant produced by your liver and is essential in the removal of toxins in your blood. Without glutathione, your liver and kidneys are less capable of doing their jobs. (2)

Chronic use of acetaminophen, even at low doses, can result in lower glutathione production and more free radical production. At the very least, this can result in a release of free radicals throughout your system. Or, as a worst case scenario, end in liver failure and other issues.

NAC can improve the efficiency of your liver and kidneys even if they’ve undergone chronic abuse. These organs are vital to your health. Adding this product to your daily regimen might be exactly what you need to ensure full health and capability.

NAC as an Acetaminophen overdose cure

Acetaminophen is found in Tylenol, and chronic usage destroys your liver’s supply of glutathione. You need that to destroy toxins in your system. Acetaminophen overdose is one of the most common reasons for liver failure. This is the reason why most hospitals stock up on NAC.

NAC is hepatoprotective. This means that it can protect your cells from damage that could kill them. This is because NAC has a way to intervene in cell responses to toxins like acetaminophen (via glutathione).

NAC is an Antioxidant

Taking an NAC supplement is one of the best ways to improve antioxidant activity in your body. Free radicals enter your system through a million different pathways. Your body requires the proper tools to handle them and prevent cellular degeneration.

NAC provides extra cellular protection to cells that could be damaged by free radicals. This is because of the associated glutathione production but also because cysteine is an excellent cell protector (4).

NAC to Boost your Immune System

Along the same lines, because NAC is such a great antioxidant, it is also a great way to boost your immune system.

There was a 2008 study done on the effects of NAC on post-menopausal women’s immune systems. The results showed the possibility of restoring immune systems to what they were when they were younger. (5)

Typically menopausal women are at risk because their immune systems are depressed. NAC can boost immune health because of antioxidants and its ability to decrease inflammation.

NAC for Addiction recovery

The impact NAC has on addiction recovery is becoming more and more pronounced. One of the biggest changes it makes in cellular behavior is in regards to glutamate. Glutamate is a key player in the creation of addictions as well as recovering from them.

Glutamate works alongside dopamine in the buildup to fully addictive behaviors. (6) This is because glutamate influences dopamine to make things feel even better. It increases the feelings and effects of drugs on the dopamine system. (7)

NAC’s Neurotransmitter Impacts:

This is, again, associated with antioxidant activity. Although, glutamate impacts and cell moderation can also be thanked for boosting brain health.

According to Shahripour, Harrigan, and Alexandrov in their piece N-acetylcysteine (NAC) in neurological disorders: mechanisms of action and therapeutic opportunities:

“NAC has a broad spectrum of actions and possible applications across multiple conditions and systems. As a drug, NAC represents perhaps the ideal xenobiotic, capable of directly entering endogenous biochemical processes as a result of its own metabolism. In addition, NAC may cross the BBB. In neurological diseases, there is a potential to explore doses and duration of treatment with NAC to achieve cytoprotection.” (8)

Which is science-y speak for: NAC is so good for your cells that it would be ignorant to think that it wouldn’t be good for your brain. In this article, the writers outline how NAC can remove toxins, regulate cells, and protect your cells from free radicals.

When it comes to using NAC for neurological issues, always go by your doctor’s prescription if you intend to see results. This is not a guaranteed solution, and isn’t widely used. Do not forgo a prescribed treatment in favor of taking NAC. Always listen to your doctor. Click here to try one of our Top 10 NAC supplements.

What is the Best Way to Get NAC?

NAC can be found naturally in a bunch of food sources, whether plant or animal. This makes NAC deficiency fairly rare. You get it in most meats, dairy, eggs, broccoli, peppers, and so many other sources.

This doesn’t lessen the need for it, though. It’s one of those things where increasing levels either on doctor’s orders, or at small doses, will likely provide some base-level improvements.

For example, if you were to invest in our top product, Nutricost’s NAC, you could comfortably start at 600mg (which is one NAC capsule). But if you were to invest in a product with more than that, you would want to only take it a couple days a week or cut the pill in half.

The best way to take NAC is through a supplement. This gives you control over how much you are getting in your system and allows you to watch whether or not it’s affecting you like you want it to.

Check out our Top 10 NAC Supplements below!

NAC Side Effects?

Side effects are uncommon, but typically revolve around diarrhea, nausea and constipation. What most studies have found is that the people who notice these symptoms are allergic to NAC itself. So if you do by any chance notice these symptoms, please stop taking NAC and call your doctor. If you are allergic to NAC, it will be important to find other ways to improve any health issues.

We also recommend starting off with the supplement slowly to ensure that you are not allergic to it. It is better to take small doses at first and build up to the full dose recommended. This can help you see if you’re reacting adversely.


Our top 10 list of NAC supplements is organized to reflect what you most value in your supplements. First and foremost is quality. All of our top ten supplements meet high standards of quality and come from brands with a proven record in excellence and purity. Another important factor in deciding the top ten was cost. You don’t have to pay through the nose to get a high-quality NAC supplement. In addition, all the companies represented on our list have stellar records with customer service and prompt shipping. This ensures that your supplement experience is enjoyable from the first click to your final dose.


  1. Sansone, R. A., & Sansone, L. A. Getting a Knack for NAC: N-Acetyl-Cysteine. Innovations in Clinical Neuroscience, 8(1), 10–14. (2011)
  2. Chun LJ, Tong MJ, Busuttil RW, Hiatt JR.Acetaminophen hepatotoxicity and acute liver failure. J Clin Gastroenterol. 2009 Apr;43(4):342-9. doi: 10.1097/MCG.0b013e31818a3854.
  3. Susan E Farrell, MD. Acetaminophen Toxicity Treatment & Management Medscape Jan 23, 2018
  4. Chad Kerksick and Darryn Willoughby The Antioxidant Role of Glutathione and N-Acetyl-Cysteine Supplements and Exercise-Induced Oxidative StressJ Int Soc Sports Nutr. 2005; 2(2): 38–44. Published online 2005 Dec 9. doi: 10.1186/1550-2783-2-2-38
  5. Arranz L, Fernández C, Rodríguez A, Ribera JM, De la Fuente M. The glutathione precursor N-acetylcysteine improves immune function in postmenopausal women. Free Radic Biol Med. 2008 Nov 1;45(9):1252-62. doi: 10.1016/j.freeradbiomed.2008.07.014. Epub 2008 Jul 27.
  6. Erin A. McClure, Cassandra D. Gipson, Robert J. Malcolm, Peter W. Kalivas, and Kevin M. Gray Potential Role of N-Acetylcysteine in the Management of Substance Use Disorders CNS Drugs. Author manuscript; available in PMC 2014 May 4. Published in final edited form as: CNS Drugs. 2014 Feb; 28(2): 95–106. doi: 10.1007/s40263-014-0142-x
  7. T M Tzschentke & W J Schmidt Glutamatergic mechanisms in addiction Molecular Psychiatry Molecular Psychiatry 8, 373–382 (2003)DOIdoi:10.1038/sj.mp.4001269
  8. Bavarsad Shahripour, R., Harrigan, M. R., & Alexandrov, A. V. N-acetylcysteine (NAC) in neurological disorders: mechanisms of action and therapeutic opportunities. Brain and Behavior, 4(2), 108–122.

#1 - N-Acetyl L-Cysteine

Nutricost’s N-Acetyl L-Cysteine is a top-rated NAC supplement because of its purity and guaranteed quality. With 600 mg per capsule, you are guaranteed your money’s worth. NAC is one of the most well-supported natural supplements on the market, and getting the best of the best can help you boost your health.

  • High Quality
  • 100% Pure
  • 600 mg Per Capsule
  • Liver Support
  • 90-Day Guarantee

NAC is the go-to supplement for Tylenol overdose. Tylenol is made of the chemical acetaminophen, which is used primarily for reducing inflammation and treating pain. Too much of this or chronic usage over an extended period of time can lead to liver failure. NAC helps glutathione production in the liver, which is necessary for toxin processing and reduction.

Outside of proper liver function, NAC is great for boosting your immune system, which helps reduce chances of catching colds or flu. It’s also known for helping recovering addicts avoid cravings and for helping OCD sufferers avoid the more harmful behaviors associated with OCD.

Keep Reading »

#2 - VitaDirect N-Acetyl L-Cysteine

N-Acetyl L-Cysteine (NAC) helps support the body’s production of glutathione, which is a powerful antioxidant that fights free radicals that can damage cells. NAC can also support healthy liver function. VitaDirect offers 600 mg of high-quality NAC at an affordable price. Keep Reading »

#3 - NOW NAC Veg Capsules

NOW’s N-acetyl Cysteine Veg capsules are chock-full of important products. They’ve fortified the NAC bioavailability and effectiveness with their inclusion of selenium and molybdenum. Both are essential for the proper breakdown and utilization of NAC.

  • Highly Bioavailable
  • Non-GMO
  • 250 Capsules
  • 600mg Per Capsule
  • Free Radical Protection

Improve your body’s effective toxin and free radical reduction with NOW NAC Veg Capsules. Give your liver the extra needed support to sustain toxin removal especially in the face of potential acetaminophen overuse.

Get this dynamic product for just under .07 a serving!

Keep Reading »

#4 - Jarrow Formulas N-A-C Sustain

Jarrow Formulas’ N-A-C Sustain is the perfect way to boost L-cysteine in the system. L-cysteine is a non-essential amino acid that can be produced easily when methionine levels are maintained. But it becomes essential when dealing with infants or chronically ill patients.

  • Optimized Release
  • Vegan
  • 600 mg Per Capsule
  • 18 Cents a Capsule
  • Oxidative Stress Protection

By boosting L-cysteine, you also boost liver health and provide antioxidant support to cells. This will boost immune system function, liver detoxification, and cell protection. Jarrow Formulas is one of the few companies whose product is used continually to test the positive effects of NAC in human systems.

N-A-C Sustain is a quick and slow release product that provides for excellent results in the long and short term.

Keep Reading »

#5 - Doctor's Best NAC Detox Regulators

Boost glutathione production in your liver with Doctor's Best NAC Detox Regulators. And enjoy the added benefits that stem from the inclusion of selenium and molybdenum, both of which have been proven to improve the uptake of NAC in your system while kicking its efficiency up a notch.

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#6 - Swanson Nac N-Acetyl Cysteine

Swanson Nac N-Acetyl Cysteine is a great natural way to boost the amino acid, cysteine in your system. Each serving contains 600 mg of pure encapsulated NAC, which can reduce free radical activity in your system, boost liver function, and improve your immune system!

Keep Reading »

#7 - BulkSupplements Pure NAC

BulkSupplements’ Pure NAC defies standards yet again, providing your essential NAC supplement in powdered, rather than encapsulated, form. This gives an advantage especially to those who would add it to a typical pre-workout or post-workout shake. ¼ tsp will provide you more than enough to hit your daily dose and ensure you catch all the amazing benefits.

Keep Reading »

#8 - Life Extension N-Acetyl-L-Cysteine

Promote entire bodily health with Life Extension’s N-Acetyl-L-Cysteine product. This easily-absorbed and transmitted supplement is great for boosting antioxidant activity, which has a hand in immune, bronchial, and cellular health. And while you’re at it, ensure that your liver continues to function properly!

Keep Reading »

#9 - Best Naturals NAC N-Acetyl-Cysteine

Improve your liver with Best Naturals NAC N-Acetyl-Cysteine product. This supplement is easily absorbed and transmitted, which makes it great for boosting antioxidant activity. That gives it an extra hand in immune, bronchial, and cellular health.

Keep Reading »

#10 - Wel EssentialsTM NAC (N-Acetyl-Cysteine)

In every serving, you will get 600 mg of NAC, which can reduce free radical activity in your system, boost liver function, and improve your immune system. You’re also guaranteed the inclusion of other top liver health-promoting ingredients. Wel EssentialsTM NAC is a great natural way to boost health all over your body!

Keep Reading »

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