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Swanson Premium

NAC N-Acetyl Cysteine

4.7 out of 5 (103)
Customer Favorite

NAC N-Acetyl Cysteine

Item: SW854

  • Amino acid with powerful antioxidant protection

  • Terrific free radical defender that won't dent your pocketbook

  • Supports liver health and more

600 mg 100 Caps
Caps Size: 0

Retail $12.49
In Stock

"I will never be without this product. My kidneys and liver are healthier because of this product. It helps to move the toxins out of your system. ..." ~product review by AngelHuggles

  • Amino acid with powerful antioxidant protection

  • Terrific free radical defender that won't dent your pocketbook

  • Supports liver health and more

When free radicals attack, fight back with NAC! As a powerful antioxidant amino acid, Swanson NAC (N-acetyl cysteine) is an important weapon in the war against free radicals. NAC helps replenish glutathione, a critical component of the body's defense system. It supports liver health and much more.


Q: Does n-acetyl cysteine have an odor?
A: N-acetyl cysteine (NAC) is a derivative of the non-essential sulfur-containing amino acid cysteine. Sulfur has an unpleasant odor commonly described as rotten egg smell. Some batches smell stronger than others.

Terms and Ingredient Definitions

Supplement Facts

Serving Size 1 Capsule

  Amount Per Serving % Daily Value
N-Acetyl-Cysteine (NAC) 600 mg *

*Daily Value not established.

Other ingredients: Gelatin, magnesium stearate.

Suggested Use: As a dietary supplement, take one capsule per day with water or as recommended by your healthcare provider.

WARNING: Do not take this product if you are pregnant or nursing. Consult your healthcare provider before use if you are taking any prescription medication or if you have a medical condition. Discontinue use if you experience gastrointestinal discomfort.

Relative Size

Printable Pill Size Guide

Shipping Weight

.22 lbs

Summary of Customer Ratings & Reviews

Customer Ratings & Reviews

Rated 4.7 out of 5 by 103 reviewers.
Rated 5 out of 5 by good product good service and excellent product February 15, 2016
Rated 5 out of 5 by good product This supplement was recommended to me. I have to say that I think it really does what it says. I believe it has boosted my immune system. February 4, 2016
Rated 5 out of 5 by Great product, great service, great price! I used to pay 10 times (really) for a similar product marketed in an MLM manner. Found this site with some search using the ingredient list and much reading about it. A positive review in a compare products analysis from a reputable website convinced me to try Swanson. Best decision so far! To me, this product is as effective as the one I used but really 10 times cheaper. Also shipping was an incredibly fast 10 _calendar_days to Montreal, Canada! I bought a bottle for a friend and my Bro' as I know it works! Rest assured, I'll make it a monthly order, here, from now on! December 11, 2015
Rated 5 out of 5 by Effective Whenever I feel weak, I take one of these and by the next day I feel better. Very effective. My family use it and also notices this. November 13, 2015
Rated 5 out of 5 by An essential These are so potent with sulfur. Open one up and it's rich in sulfur smells. Then you can use it in a mouth rinse (pulls out dental toxins). My body just loves this stuff. Sulfur is needed in the body to do almost everything but dental work etc use it all up robbing the supplies from the rest of the cells that need to flush and detox. Sulfur from foods gets lost when heated and the NAC works great to get those stores back up. NAC is right on par with taking vitamin C or E etc - essential! And nobody does a top of the line NAC at such fair pricing, like Swanson's. October 31, 2015
Rated 5 out of 5 by Very effective Very effective, especially when combined with other amino acids. Make sure to take some vitamin c with it. September 25, 2015
Rated 5 out of 5 by NAC is useful NAC is useful to me. Glad I checked the web on what to order earlier. August 7, 2015
Rated 5 out of 5 by Great product and price I've been using this NAC for a few years since my Naturepath recommended it. I tried some from another company and couldn't take it due to the strong sulphur smell. Swanson Premium NAC has never had a strong odor in all the years I've used it. I found out that the smell can be caused by poor manufacture or handling practices. This shows me that Swanson has higher standards than some other companies. October 17, 2014
Rated 5 out of 5 by great purchase, as always I was recommended this product for a friend and I am very happy with it. August 16, 2014
Rated 5 out of 5 by My Preferred Brand This is another Great Quality Supplement from Swanson. I also have to commend Swanson for their easy to "Open and Use" supplement bottles. Most people overlook this important feature in their reviews, but I really appreciate the safety and convenience of the foil seals Swanson uses. With many other brands, it's a royal pain struggling to remove those thick paper seals that leave behind an unsealable ring on the bottle top (which sheds bits of itself with use). Swanson's foil seals are easy to cut out and leave behind a nice clean foil ring that easily seals the bottle again when the top is put back on. I highly recommend this product. July 10, 2014
Rated 1 out of 5 by NAC doesn't meet Swanson's 7 leaves In the quest of complementing my diet with sulphur-based natural products I came across NAC. It had good recommendations and there are vast studies that support its use. However, it is very hard to measure the benefits in light of the adverse effects it causes. I was aware of the disclaimer by Swanson on NAC, but had I known that it doesn´t take too long or a very high dose to experience uncomfortableness, I would had use this money in something else. Since I closely monitor all my dietary supplements, I knew NAC was causing GI problems, because it is the ONLY product I was taking from Swanson that is artificially slightly modified in its molecule. My disappointment didn't allow me to notice Swanson's return policy, so I disposed the other two bottles. Lesson: stick to the 7 leaves May 31, 2014
Rated 4 out of 5 by Good supplement Everyday supplement for good lung function and antioxidant booster. low price & big value. May 13, 2014
Rated 5 out of 5 by Love it! Wonderful quality, fast delivery and it works for me. May 6, 2014
Rated 5 out of 5 by Great Buy This is a supplement that I take every day, so for me it is a great buy. March 19, 2014
Rated 5 out of 5 by NAC I can breath better during workouts since starting to take NAC two years ago. Two of the many benefits of NAC include replenishment of glutathione as well as protection of the liver. March 3, 2014
Rated 5 out of 5 by Top choice for NAC I have bought these supplements as gifts for so many friends, and recommend it to everybody I know. NAC is proven to boost glutathione production and it is an incredible antioxidant. The clinical, double-blind published research on the benefits of this supplement is remarkable. I take 4 capsules per day, 6 days a week, and Swanson's is not only the best in quality, but it's the best price too. January 27, 2014
Rated 5 out of 5 by protect your liver! I will never be without this product. My kidneys and liver are healthier because of this product. It helps to move the toxins out of your system. Cleaning out your liver and kidneys that filter everything out of your system. (in my opinion) December 25, 2013
Rated 5 out of 5 by this is trully a natural energy product, in some of my students and in my self it has also stimulated more valve movements, I recomend this product as a very natural product, forget the 5 hour stuff, that gave me the gitters and and down when it wore out. December 20, 2013
Rated 4 out of 5 by Great product great price I am a new customer and I am very pleased with the quality of the service, great products, and of course the low prices. It is good to know you can save money without sacrificing quality. December 1, 2013
Rated 5 out of 5 by Good price Just recently started using at recommendation of Functional Medicine doctor. Hoping it is able to help the reason for starting. Great price. November 25, 2013
Rated 5 out of 5 by Great Product A great building block for energy - it really helps me November 18, 2013
Rated 5 out of 5 by Most effective and best value The Swanson Premium NAC has proven itself to be of consistent quality and more cost-effective than some competitor products. Overall, this Swanson Premium supplement, along with ALA, have made a bigger impact on my health than versions tried from competing companies when comparing for dosage. November 14, 2013
Rated 5 out of 5 by happy I was very happy with the fast shipping and quality of the product November 10, 2013
Rated 5 out of 5 by I am extremely happy with this product. The price is right. It is very convenient ordering from this site, no need to even go to the store. The site is also very easy to navigate. I would absolutely recommend this product and purchasing directly from swanson for anyone thinking about making a purchasing. September 17, 2013
Rated 3 out of 5 by Did not notice any difference I really did not notice any difference while taking this. I gave it a mostly average rating though because I'm not sure I would have noticed a difference and because I didn't see any side-effects either. It's easy enough to take. September 11, 2013
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Lee Swanson, Founder of Swanson Health Products

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