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Source Naturals, N-Acetyl Cysteine, 1000 mg, 120 Tablets

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$20.23 (46)
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In Stock
  • Expiration Date: Jun 2020
  • Shipping Weight: 0.59 lbs (0.27 kg)
  • Product Code: SNS-00170
  • UPC Code: 021078001706
  • Package Quantity: 120 Tablets
  • Dimensions: 2.6 x 2.6 x 4.6 in, 0.5 lbs (0.23 kg)
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Product Overview


  • Dietary Supplement
  • Antioxidant Support

N-Acetyl cysteine is a stable form of the sulfur amino acid L-cysteine, and is a powerful antioxidant. It is also a precursor of glutathione, a major antioxidant. Glutathione is activated by the selenium-containing glutathione peroxidase, one of the most important antioxidant enzymes in the body. N-Acetyl cysteine is better than glutathione supplements, which may break down during digestion and lose potency.

Suggested Use

1 to 2 tablets daily.

Other Ingredients

Dibasic calcium phosphate, stearic acid, modified cellulose gum, colloidal silicon dioxide, and magnesium stearate.

Hypoallergenic: Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.


Keep tightly closed in a cool, dry place.

Do not use if you are taking any form of prescription nitrate such as nitroglycerin. If you are pregnant, may become pregnant, or breastfeeding, consult your health care professional before using this product.

Do not use if either tamper-evident seal is broken or missing. Keep out of the reach of children.

Supplement Facts
Serving Size: 1 Tablet
  Amount Per Serving %DV
Calories 5  
Calcium 58 mg 6%
N-Acetyl Cysteine 1 g
†Daily Value not established.
iHerb Customer Reviews


Posted by 5092092589296495966 on Dec 01, 2016

I haven't been using long enough to tell what it is doing. My doctor insisted that I take this. I suppose he knows best so I will continue to take it, I will order more when I finish this bottle.

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Posted by 4652114262566062819 on Oct 03, 2016

I have been using this product now for 8 months, after my doctor suggested taking this with my anti-depressants. I feel so much better.

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too large

Posted by 5560351778809882609 on Jul 05, 2016

Very difficult to swallow - even after breaking it in half.

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Great immune system booster

Posted by 5651877214773653121 on Jun 17, 2016

I've been using this product daily (2,000mg) for over two years and have had hardly any respiratory infections over that period. It's a great immune system booster. Highly recommended.

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Cured my horrible 4 months cough

Posted by 5040988076438410898 on May 27, 2016

I had a cold that just would not yield from Christmas to April. I was on antibiotic (doxycycline) for 2 weeks during this time when the cold vanished. As soon as I got off the antibiotics the cold came back with vengeance. I had actually ordered this stuff for my dad who has early parkinson's disease so I popped a pill of 1000 mg N-acetylcysteine just to show him that it is safe to take. Within an hour I started to cough up phlegm like there was no tomorrow. It felt as if I coughed up stuff from my throat that had resided there for years. Anyway, I went to bed and woke up cured from my cold. AMAZING! I decided to keep taking it to make sure the cold/cough did not return. It didn't. I have kept taking it since then. My dad also takes 2 per day (morning and night) along with his parkinson's medication (dopamine) and he has become much less fatigued with this supplement - he felt a difference on day 2.

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