No Thanks

Your 10% Off Promo Code is on the Way! Thanks for signing up for emails.

You're now signed up to receive exclusive deals and savings opportunities!

Thanks again for connecting with us. Keep an eye on your inbox — your first coupon is on its way!

Thank You! This email address is already signed up

You are signed up for the following:

  • Offers
  • Recipes
  • E-Newsletter
  • Updates & Reminders

Thank you for your interest and be assured that you will continue to receive our emails at this address.

Look for your next communication from us within the next week.


We are having trouble processing your request.

Our apologies!

Please try again later.

Search Please enter an item number or keyword
Shop by
Do You
Need Help?

Swanson Premium

NAC N-Acetyl Cysteine

Customer Favorite

NAC N-Acetyl Cysteine

Item:  SW854

  • Swanson NAC (N-Acetyl-Cysteine) offers 600 mg in each capsule

  • 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

MSRP $12.49
Yes! I want 10% off and free shipping over $50 on my next automatic shipment of this item.  days. Learn more
In Stock

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 Size Guide

Shipping Weight

.22 lbs

  • Swanson NAC (N-Acetyl-Cysteine) offers 600 mg in each capsule

  • 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 and offers 600 mg of NAC per capsule. 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.

Swanson Premium NAC N-Acetyl Cysteine Reviews

Summary of Customer Ratings & Reviews

Customer Ratings & Reviews

NAC N-Acetyl Cysteine is rated 4.7 out of 5 by 111.
Rated 5 out of 5 by from Great product! I feel this product is a very useful addition to my health regimen and helps strengthen my immune system.
Date published: 2017-07-17
Rated 5 out of 5 by from Great product. I take this everyday, it really works.
Date published: 2017-03-15
Rated 5 out of 5 by from Pure NAC NAC has many benefits, a smiple search will reveal them. This NAC is as good a source as I have been able to find. While many other manufacturers included unwanted ingredients like rice flour, this one is free from such potentially counterproductive fillers.
Date published: 2016-12-17
Rated 5 out of 5 by from Swanson NAC Product Review I found the Swanson NAC to be very convenient to take because they are in small 600 mg capsules and are easier to swallow that the larger NAC capsules. They are priced better than competitive products, with the excellent quality I find consistent with the other Swanson products. All in all, I am very pleased with this product and will continue to used it.
Date published: 2016-12-11
Rated 5 out of 5 by from good combo This is a great substance to take in companion to ALA. Is suppose to be a good body detox.
Date published: 2016-11-27
Rated 5 out of 5 by from as part of support system. Using it as my daily support system, as per my specific condition.
Date published: 2016-10-21
Rated 5 out of 5 by from really works I think this is the best supplement I have ever bought! I actually see real results! My liver doesn't seem to function properly and when it is acting up I get toxins backed up and I get a symptom of my eyes burning like crazy. Now when this happens, I take more NAC and it actually gets better! I had never found a way to relieve this before and I have tried everything!
Date published: 2016-09-04
Rated 5 out of 5 by from good product good service and excellent product
Date published: 2016-02-15
Rated 5 out of 5 by from 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.
Date published: 2016-02-04
Rated 5 out of 5 by from 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!
Date published: 2015-12-11
Rated 5 out of 5 by from 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.
Date published: 2015-11-13
Rated 5 out of 5 by from 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.
Date published: 2015-10-31
Rated 5 out of 5 by from Very effective Very effective, especially when combined with other amino acids. Make sure to take some vitamin c with it.
Date published: 2015-09-25
Rated 5 out of 5 by from NAC is useful NAC is useful to me. Glad I checked the web on what to order earlier.
Date published: 2015-08-07
Rated 5 out of 5 by from 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.
Date published: 2014-10-17
Rated 5 out of 5 by from great purchase, as always I was recommended this product for a friend and I am very happy with it.
Date published: 2014-08-16
Rated 5 out of 5 by from 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.
Date published: 2014-07-10
Rated 1 out of 5 by from 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
Date published: 2014-05-31
Rated 4 out of 5 by from Good supplement Everyday supplement for good lung function and antioxidant booster. low price & big value.
Date published: 2014-05-14
Rated 5 out of 5 by from Love it! Wonderful quality, fast delivery and it works for me.
Date published: 2014-05-06
Rated 5 out of 5 by from Great Buy This is a supplement that I take every day, so for me it is a great buy.
Date published: 2014-03-19
Rated 5 out of 5 by from 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.
Date published: 2014-03-03
Rated 5 out of 5 by from 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.
Date published: 2014-01-27
Rated 5 out of 5 by from 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)
Date published: 2013-12-25
Rated 5 out of 5 by from 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.
Date published: 2013-12-20
  • y_2018, m_2, d_16, h_21
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.7
  • cp_1, bvpage1
  • co_hasreviews, tv_21, tr_90
  • loc_en_US, sid_SW854, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_swansonhealth
Swanson Quality Assurance

Why Shop Swanson®?

We know how important your health is to you and your loved ones. That’s why we’re focused on delivering only high quality products you can trust at the best value.

Our lab evaluates every product to make sure it’s compliant with strict standards and government regulations, and we fully believe in and stand behind our products. If you’re dissatisfied for any reason, we’ll give you a full refund and pay return shipping.

Swanson's Standards

We are dedicated to offering the highest quality products at the best price. Find out more about how we ensure such a high standard in everything we do.

Learn More
Customer Service

Easy Refill

  • Get your favorite products delivered automatically
  • 10% off future orders of Swanson brand products in your subscription
  • FREE standard shipping on all future orders over $50
  • Control the frequency, delivery date, item quantity... or cancel at any time
  • Email reminders before each delivery
See all FAQs here