• N-acetyl-cysteine, Antioxidant, Life Extension, NAC, Glutathione, dry eye,

Life Extension N-Acetyl-L-Cysteine, 600 mg, 60 Vegetarian Capsules

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N-acetyl-cysteine (NAC) is an antioxidant and a free radical-scavenging agent. It also improves the effectiveness of glutathione in the body. NAC has been shown to support a healthy thickness of the tear film and thus may reduce the effects of dry eye syndrome.

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Supplement Facts

Serving Size: 1 capsule

Serving Per Container: 60

Amount Per Serving
N-acetyl-L-cysteine 600 mg
Dosage and Use:

  • Take one capsule one to three times daily with or without food, or as recommended by a healthcare practitioner.
Caution: Those who supplement with NAC should drink six to eight glasses of water daily to prevent cysteine renal stones. Cysteine renal stones are rare but do occur.

  • If pregnant, nursing, or undergoing treatment for a medical condition, consult your physician before taking this product.
  • Keep out of reach of children.
  • Do not exceed recommended dose.

N-acetyl-L-cysteine is a powerful antioxidant which works hand in hand with glutathione to provide necessary support to the eyes, and to a number of other bodily systems. It is also thought to support long term relief of dry eyes.

Benefits of Life Extension N-Acetyl-L-Cysteine

  • 600 mg of high quality N-Acetyl-L-Cysteine
  • Helps the immune system repair damage from oxidative stress
  • Improves the production and effectiveness of glutathione in the body
  • Supports against dry eyes


What is NAC?

N-acetyl-L-cysteine (NAC) is the acetylated form of L-cysteine. It is primarily used for its antioxidant properties and as a free radical-scavenging agent. NAC is renowned for its bioavailability within the body, even when taken orally. It has been shown to aid in the protection of cells directly and to better support the immune system as a whole. It also 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. As a potent antioxidant, NAC has been shown to protect against oxidative stress-induced neuronal death in cultured granule neurons.1,2


The Role of NAC in Better Eye Health

Perhaps the most important function of NAC is to increase intracellular glutathione at the cellular level. NAC can also act as a precursor for glutathione synthesis and a stimulator of the cytosolic enzymes involved in glutathione regeneration. Glutathione is another powerful antioxidant which is found in particularly high concentrations in the lens of the eye. Without a proper supply of glutathione, eye function will suffer greatly in a number of different ways.2

The surface of the eye utilizes a tear film to provide defense and nourishment to the surrounding tissues. Without an adequate supply of tears, the tear film will diminish and one might experience dry eye syndrome, a condition that causes the eyes to sting, itch, and turn red and puffy. Artificial tears can be used to temporarily relieve the symptoms of dry eye, but in order to find lasting relief it is necessary to strengthen the tear film itself. In a 2017 study, researchers found that the administration of NAC improved the tear film thickness of recipients by a significant amount when compared to the placebo group.3


1. N-Acetyl-L-cysteine and its derivatives.
2. NAC and glutathione
3. NAC and dry eyes.

* These statements have not been evaluated by the FDA. These products are not intended to diagnose, treat, cure, or prevent any disease or medical conditions. The products and information provided are not intended to replace professional medical advice or treatment. Individual results may vary. Seek the advice of a qualified professional for any health concern, and share all information pertaining to your health, including the use of supplements, with your health provider.