N-Acetyl-L-Cysteine (NAC) - 600 mg, 60 vegetarian capsules by Life Extension

61 units in stock This product will be discontinued when sold out

An Effective Antioxidant and Free Radical-Scavenging Agent

  • Helps protect cells directly
  • Vital detoxifier
  • Helps support the immune system
Usually: $10.50


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.136-138 Cysteine also helps synthesize glutathione, the body’s most important intracellular antioxidant and a vital detoxifier.139-142

N-acetyl-L-cysteine (NAC) is the acetylated form of L-cysteine that has been used to break up pulmonary and bronchial mucous.143-146 It is very efficiently absorbed and has been shown to protect cells directly and support the immune system.146-155 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.146 NAC has been shown to protect against oxidative stress-induced neuronal death in cultured granule neurons.156

*These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure or prevent any disease.

Label Information

Supplement Facts
Serving Size: 1 vegetarian capsule
Servings Per Container: 60
Amount Per Serving%DV
N-acetyl-L-cysteine600 mg**
** Daily value (DV) not established

Do not purchase if outer seal is broken or damaged.

  • Suggested Use: Take one capsule one to three times daily with or without food, or as recommended by a healthcare practitioner.
  • Storage: Store in a cool, dry place. Keep out of reach of children.
  • Contraindications: 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. 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. DO NOT EXCEED RECOMMENDED DOSE.
  • Other Ingredients: vegetable cellulose (capsule), vegetable stearate, silica.


Customer Reviews

Based on 2 reviews
Susan W.

I take it everyday as a preventive, and I love it!

Kathleen W.
Thanks for N Acetyl L Cysteine

When I was told I was low in N Acetyl L Cysteine, I had never heard of it. My doctor suggested I get some from ProHealth and I have been taking it for years. Though I cannot say I never get sick, it is rare. I thank Ultra Antioxidant and N Acetyl L Cysteine for my good immune system.