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Life Extension, N-Acetyl-L-Cysteine, 600 mg, 60 Veggie Caps

By Life Extension

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  • Product Code: LEX-15436
  • UPC Code: 737870154365
  • Package Quantity: 60 Veggie Caps
  • Dimensions: 2.1 x 2.1 x 3.8 in, 0.15 lbs (0.07 kg)
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Product Overview

  • Boosts Cellular Glutathione Levels
  • Dietary Supplements

L-cysteine is a conditionally essential amino acid, one of only three sulfur-containing amino acids, the others being taurine (which can be produced from L-cysteine) and L-methionine (from which L-cysteine can be produced in the body by a multi-step process). Cysteine plays a role in the sulfation cycle, acting as a sulfur donor in phase II detoxification and as a methyl donor in the conversion of homocysteine to methionine. Cysteine also helps synthesize glutathione, the body’s most important intracellular antioxidant and a vital detoxifier.

N-acetyl-L-cysteine (NAC) is the acetylated form of L-cysteine that has been used to break up pulmonary and bronchial mucous. It is very efficiently absorbed and has been shown to protect cells directly and support the immune system. NAC is an antioxidant and a free radical-scavenging agent that increases intracellular glutathione at the cellular level. NAC can act as a precursor for glutathione synthesis as well as a stimulator of the cytosolic enzymes involved in glutathione regeneration. NAC has been shown to protect against oxidative stress-induced neuronal death in cultured granule neurons.

Suggested Use

Read the entire label and follow the directions carefully prior to use.

Take one (1) capsule one to three times daily with or without food, or as recommended by a healthcare practitioner.

Other Ingredients

Vegetable cellulose (capsule), vegetable stearate, silica.


Caution: Those who supplement with NAC should drink 6 to 8 glasses of water daily in order to prevent cysteine renal stones. Cysteine renal stones are rare but do occur.

  • Keep out of reach of children.
  • Do not exceed recommended dose.
  • Do not purchase if outer seal is broken or damaged.
  • When using nutritional supplements, please consult with your physician if you are undergoing treatment for a medical condition or if you are pregnant or lactating.

Store tightly closed in a cool, dry place.

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Supplement Facts
Serving Size: 1 Vegetarian Capsule
  Amount Per Serving % Daily Value
N-acetyl-L-cysteine 600 mg **
**Daily Value not established.

iHerb Customer Reviews

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Posted by alloriginal on May 21, 2013

This is one of those lesser-known supplements that everyone should learn about. It is a powerful antioxidant, with a wide range of effects. It seems to work primarily by increasing glutathione levels in the body. Let's focus on what it does for the lungs: NAC is a potent mucolytic (it breaks down and liquifies mucus). For anyone with COPD, emphysema, chronic bronchitis, or who is a smoker or former smoker, NAC is a godsend. It will work quickly to open airways that were previously clogged. One capsule, on an empty stomach (seems to work best when taken with vitamin c) is all it takes to work what seems like a miracle. In an hour or so, breathing becomes much more free and your lungs feel like they are 12 years old again. At less than 20 cents per day, and with no bad side effects (I've been using it for decades without problems) this is one of the most effective nutrients there is. Who wouldn't use it? If ordering from Iherb for the first time, you're in for a treat: Iherb has the best selection, lowest prices and fastest shipping of any online merchant. I believe that nutritional supplements saved my life. I've tried a lot of products, and I know what works and what doesn't. My reviews are honest, straighforward, and based on my experience. Read my other reviews to quickly learn from my three decades of research and experimentation.

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51 people found the following review helpful


Posted by Reviewer1434258 on Mar 20, 2015

N-aceytl Cysteine (NAC). NAC is used by the US Navy to treat servicemen who are exposed to very loud noises, such as explosions, which damage the ears and cause ringing. NAC is also used in emergency room treatment for liver failure due to aspirin or Tylenol overdose. A few years ago, I began taking three of the NAC per day, and due to an amazing rejuvenation experience, I spent a month working 15-hour days to write a paper and had this paper published a few months later. NAC is the precursor of glutathione, and glutathione has been described as the "Monther of all the anti-oxidants". Fat exposed to oxygen will oxidize and become rancid. The human body is mostly fatty acids, and is also full of oxygen. Even venous blood has 50% oxygen saturation. The reason that we do not simply oxidize and fall down is due to glutathione. This is why I take NAC.

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14 people found the following review helpful

Recommended to boost glutathione levels

Posted by Reviewer1796917 on Jul 22, 2013

My nutritionist recommended this product to help boost my glutathione levels. It seems to be working, as I am tolerating eggs, onion, garlic, etc. (sulfur issue) better now.

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7 people found the following review helpful

bad-egg smell

Posted by Reviewer1026466 on Mar 14, 2015

After taking 2/3rds of the 60 capsules, I noticed a really unpleasant smell coming from the remaining capsules in the bottle. I'm concerned about this so will not risk taking any more. I'll be switching brands next time I order.

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7 people found the following review helpful

Amazing how much better this works than any rx

Posted by 4670716386541178392 on Jun 22, 2015

It is amazing how much better this product works than any possible rx. Even more amazing why every single doctor doesn't prescribe this or at least mention it. Seriously this should be the first thing every pulmonologist should have their patients take. It breaks up the junk in your lungs and helps your body get rid of it. I take it 3x a day with a good vitamin c 500mg minimum with or without food, but some suggest on an empty stomach. Just be prepared to cough up the junk within a few hours - then you know it's really working.

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6 people found the following review helpful

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