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

By Source Naturals

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  • 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.

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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

5 Stars
4 Stars
3 Stars
2 Stars
1 Stars

Powerful antioxidant in a larger dose

Posted by Reviewer2274947 on Dec 05, 2008

I have been taking NAC for months now, and I appreciate the larger 1 gram size, also need to up my vitamin c dosage to 3 grams with this monster, otherwise it can cause more bad than good. Strong sulfur odor lets me know it means business.

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11 people found the following review helpful

Definitely shows promise

Posted by Reviewer2402786 on Oct 30, 2009

I have/had a 30% hearing loss from family genetic predisposition. I've been taking this supplement for 3-4 months now and I believe there has been definite improvement. Maybe a 10%-15% reduction. I've stopped using my hearing aids and though I still have trouble hearing I'm picking up much more conversation than I did in the past. I'm 54 but I think this is definitely worth a try. This substance was supposedly tested by the US Navy to help prevent hearing loss onboard ships but it has also helped me.

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8 people found the following review helpful

N-Acetyl Cysteine by Source Naturals

Posted by Reviewer3194334 on May 18, 2008

I like Source Naturals in general. I learned about them through Dr. David Perlmutter's book The Better Brain. I like this particular product becasue it is so highly concentrated.

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7 people found the following review helpful

Too early to tell.

Posted by Reviewer1391596 on Jun 22, 2011

I started taking 1 x 1000mg a day to see if it had any of the mucolytic affects that my research advised it might. To date I can't say that I've noticed any perceivable difference but I guess the results will be apparent during my next lung function test with my respiratory specialist. I haven't experienced any of the usual side effects such as overly smelly flatulence or feces. But then again both my flatulence and feces didn't have a particularly pleasant bouquet in the first place...any change might have been an improvement. One thing I'd recommend is to look at getting some vitamin C as well. This isn't something that iHerb or the Source Naturals instructions advise but a few minutes on google will show you that high dosages of NAC have side effects that are minimised by taking at least a 2:1 ratio of vitamin C to NAC. With a 1000mg dose of NAC you'd be taking 2000mg of vitamin C which is right on the border of the safe recommended daily intake for vitamin C before the laxative effects kick in and other long term high dosage complications such as kidney stones can occur. My 3 star rating at this stage is really just based on the good service I received from Source Naturals rather than the product itself as I haven't had a long enough exposure to NAC to make any firm decisions on whether it's been beneficial or not. Definitely recommend iHerb. The product was on my door step within 14 days...and I live in the middle of nowhere even by New Zealand standards.

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7 people found the following review helpful

Excellen t Product

Posted by Reviewer3176240 on Dec 10, 2011

Really helps my Bi-polar a lot. Great Product. Postage very slow using International Airmail to Australia it took 2 1/2 months. This is not Iherb's fault though.

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4 people found the following review helpful

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