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Jarrow Formulas N-A-C (N-Acetyl-L-Cysteine), Supports Liver & Lung Function, 500 mg, 100 Caps

4.5 out of 5 stars 110 customer reviews
| 8 answered questions
About the Product
  • Jarrow Formulas

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  • Jarrow Formulas N-A-C (N-Acetyl-L-Cysteine), Supports Liver & Lung Function, 500 mg, 100 Caps
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  • Jarrow Formulas Methylcobalamin (Methyl B12), Supports Brain Cells, 5000 mcg, 60 Lozenges
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Product Description

Size: 100

N-ACETYL-L-CYSTEINE (NAC) is a powerful antioxidant amino acid and a precursor in the body to the critical antioxidant glutathione.* Glutathione exerts a variety of protective effects; including detoxification and intracellular defense against oxidative stress.* Substances known to reduce glutathione status are acetaminophen and alcohol.*Keep out of the reach of children.

Product Details

Size: 100
  • Product Dimensions: 6 x 5 x 4 inches ; 3.4 ounces
  • Shipping Weight: 3.2 ounces (View shipping rates and policies)
  • Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B0013OSJBY
  • UPC: 790011090052 790011070023
  • Item model number: NAC
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (110 customer reviews)
  • Amazon Best Sellers Rank: #6,732 in Health & Personal Care (See Top 100 in Health & Personal Care)

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Actual product packaging and materials may contain more and different information than what is shown on our website. We recommend that you do not rely solely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. Please see our full disclaimer below.

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By JKI TOP 500 REVIEWER on August 7, 2015
Size: 200
I've been taking N-A-C on and off for more than three years, and it's helped a great deal with alleviating sinus congestion. After having tried a few different brands N-A-C supplements, I've settled on Jarrow Formulas sustained release version (also sold on Amazon). That's not to say that this version of Jarrow N-A-C doesn't work. I'm sure it does. But if this is something you're going to get serious about taking, then I would go with the extended release version of this supplement. The extended release version simply provides the body with a more consistent, sustained level of L-cysteine through the day and night. First, a little background on N-A-C...

I'm not a scientist, but I've read up a bit on N-A-C, and I'll attempt a brief overview. N-A-C supplements provide the body with extra amounts of L-cysteine, a precursor to a substance called Glutathione. In other words, taking N-A-C gives us more L-cysteine, which then gives us more Glutathione. Glutathione is a critical substance in our body, maintaining our body’s antioxidant defenses in the face of everyday assaults. Acting as an antioxidant, it detoxifies and provides intracellular defense against oxidative stress. Think of Glutathione as a street sweeper for our body. It is a major supporter of our liver and lungs. (So, why not simply skip the L-cysteine and just take Glutathione supplements instead? The reason is that Glutathione is not well digested by the body.)

Our body's supply of Glutathione may need a boost for several reasons, including alcohol consumption, acetaminophen use, chronic disease, physiological and physical stress, inadequate diet and environmental toxins. N-A-C is preferred to cysteine, or cystine, as a supplement because of its stability and solubility.
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Size: 100
I purchased this several months ago to aid in the detox of my liver. In my research, I read where this could help with detox and also as a sleep aid. It definitely helps with sleep as long as I take it very early in the evening (about 5:30-6:00p.m.) on an empty stomach or not. If I take it any later than that, I end up oversleeping in the morning by about 1 1/2 hours. I find it hard to open my eyes and get moving. Yet, taking it earlier keeps that from happening and then I can go about my day without any grogginess.

Last month I spent a week in New Orleans and really over drank the mint juleps one day. Probably totaled 7 drinks in the course of the afternoon and evening. Well, when I woke in the early morning hours, the whole room was rolling!! Bad!! I used to take a homeopathic called Nux Vomica, that would usually help hangover symptoms. But I didn't bring it with me this time. I wracked my brain to figure out what I could do for myself and remembered reading that NAC can help with overindulgence in food or alcohol because it detoxes the liver. I took a capsule and laid back down till morning. I am absolutely amazed!! It was as if I had never had a drink and I was not nauseated, dizzy or anything!! Just another normal day! So, I am sold on that part.

I've also read that if NAC is taken at the first signs of a cold, etc. that it will prevent the sickness from coming on. I haven't personally tried it for this, but if I get a sniffle, this will be the first thing I try.
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Size: 100 Verified Purchase
N-acetylcysteine is such a good supplement. It is good for liver and lung health and, back in the day, some doctors used to give it as part of the patient's regimen for lung support. Highly recommended if you have asthma.
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Size: 100 Verified Purchase
I personally like the 600 mg better because they have no smell what so ever! But the smell of these doesn't transfer to your mouth and isn't unpleasant while swallowing! I haven't had to use my inhaler for months! I have been an asthmatic since I was 3 and I am now 42! I will always take NAC from this point forward. I am shocked by how infrequent my asthma attacks are!
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Size: 200 Verified Purchase
I am looking to try this product and since at least one person mentioned the corn issue I have sent a message to Jarrow to ask if it contains corn. This is a must for me since my asthma contains a corn trigger. I will change this rating once I can try the product and find out if it will help me.

For the person who mentioned foggy brain syndrome, I have gotten a good response from taking Jarrow N-acetyl Tyrosine (does not say no corn but I have not had a reaction). It is the enzyme that assists with dopamine production assisting with relief of depression and parkinson type of symptoms. It supports brain function by supporting the neuraltransmitters. I do not seem so forgetful since I started taking this.

10/10/12

I just heard back from Jarrow and this product does not contain corn. I am ordering now so hopefully this will help me. I will post again once I know if this is helpful.

3/1/13

Wow....amazing difference. After taking this for some months, I am using a lot less asthma medicine. I am down to 1 main medicine and the emergency inhaler a few times a month. I am so happy with this product. This will stay for awhile. I am not sure why my system is not making this enzyme but until it does I will use this product.
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Disclaimer: While we work to ensure that product information is correct, on occasion manufacturers may alter their ingredient lists. Actual product packaging and materials may contain more and/or different information than that shown on our Web site. We recommend that you do not solely rely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. For additional information about a product, please contact the manufacturer. Content on this site is for reference purposes and is not intended to substitute for advice given by a physician, pharmacist, or other licensed health-care professional. You should not use this information as self-diagnosis or for treating a health problem or disease. Contact your health-care provider immediately if you suspect that you have a medical problem. Information and statements regarding dietary supplements have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease or health condition. Amazon.com assumes no liability for inaccuracies or misstatements about products.