NOW Supplements, NAC (N-Acetyl Cysteine) 600 mg with Selenium, 250 Veg Capsules
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Availability:
In Stock.
Arrives
Feb 11 – Feb 15
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Size: 250 Count (Pack of 1)
Style: Supplements
Features
- FREE RADICAL PROTECTION*: Take 1 NAC capsule with selenium twice daily for free radical protection and to maintain cellular health*
- IMPORTANT NOTE ABOUT THIS PRODUCT: Black spots may appear in NAC because of a normal oxidative reaction, but product is safe to consume. These spots are NOT mold or any other micro-contamination. Micro-testing has been performed to assess product safety
- CERTIFICATIONS/CLASSIFICATIONS: Non-GMO, Made without Gluten, Kosher, Dairy Free, Egg Free, Nut Free, Soy Free,
- GMP Quality Assured: A-rated, third-party certification means that every aspect of the NOW manufacturing process has been examined. Our in-house laboratories are ISO/IEC accredited for laboratory testing including for stability, potency and product formulation.
- Packaged in the USA by a family owned and operated company since 1968
Description
Maintains Cellular Health With Selenium N-acetyl cysteine (NAC) is a stable form of the non-essential amino acid cysteine. It is a sulfur-containing amino acid that acts as a stabilizer for the formation of protein structures, and is also necessary for the formation of glutathione. Selenium is an essential trace mineral that facilitates the production of several important enzymes.
Brand: NOW Foods
Flavor: Unflavored
Primary Supplement Type: N-Acetyl Cysteine
Unit Count: 250 Count
Item Form: Capsule
Item Weight: 0.24 Kilograms
Item dimensions L x W x H: 2.81 x 2.81 x 5.13 inches
Special Ingredients: NAC
Diet Type: Halal, Kosher
Product Benefits: Antioxidant
Is Discontinued By Manufacturer : No
Product Dimensions : 2.81 x 2.81 x 5.13 inches; 8.47 ounces
Item model number : 0086
Department : Health and Beauty>Health and Wellness
Date First Available : October 2, 2001
Manufacturer : NOW Sports - Nutrition and Wellness
Best Sellers Rank: #1,771 in Health & Household (See Top 100 in Health & Household) #22 in Amino Acid Nutritional Supplements #250 in Sales & Deals
#22 in Amino Acid Nutritional Supplements:
#250 in Sales & Deals:
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Feb 11 – Feb 15
This item is non-returnable:
Non-returnable due to Food safety reasons
View our full returns policy here.
Non-returnable due to Food safety reasons
View our full returns policy here.
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Top Amazon Reviews
Size: 100 Count (Pack of 1)
Style: Supplements
This has worked so well with clearing out mucus from my lungs. Just as a warning, it works TOO good when taking consistently! You will have a lot of phlegm but I think it was worth the purchase.
Reviewed in the United States on December 4, 2025 by Shana R
Size: 100 Count (Pack of 1)
Style: Supplements
Excellent liver support!
Reviewed in the United States on January 16, 2026 by Donna Foster
Size: 100 Count (Pack of 1)
Style: Supplements
Look, I'm not going to pretend NAC is some miracle supplement that changed my life overnight. Been taking this daily for about six weeks, and honestly? It just works. No drama, no fuss. The capsules go down easy, my stomach doesn't hate me for it, and here's the kicker - they threw in selenium. Why does that matter? Because NAC can actually deplete your selenium over time, and most people don't know that. So NOW Foods basically did your homework for you. That's the kind of attention to detail I appreciate. Fair warning: when you crack open the bottle, you'll get a whiff of that signature sulfur smell. It's not pleasant, but it's also not a deal-breaker. The capsules themselves don't taste like anything, so once you get past the initial "what died in here" moment, you're fine. Bottom line: if you're looking for a straightforward NAC supplement that doesn't require you to buy three other things to make it work properly, this is it. Good price, solid brand, does what it says on the tin. Skip it if you're expecting some kind of immediate transformation or if sulfur smells make you queasy.
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Reviewed in the United States on December 15, 2025 by Nick Y.
Size: 100 Count (Pack of 1)
Style: Supplements
It’s really nice and works well with my anxiety medication too :)) I really like it I have ADHD and it really helps me a ton I always keep those fresh packets inside so don’t get rid of those.
Reviewed in the United States on December 12, 2025 by Autumn Prestwood Autumn Prestwood
Size: 250 Count (Pack of 1)
Style: Supplements
I've been taking NAC for general wellness and antioxidant support for the better part of a year, and I decided to try this NOW brand bottle because the value is just fantastic for a 250-count. I've always trusted NOW for quality, and this product is no exception. The capsules are a standard size, easy enough to swallow, and have no aftertaste, which I appreciate. I genuinely feel they contribute to my overall respiratory health, especially during seasonal changes. The only reason I'm docking one star is the issue with speckling. After having the bottle for a month or two, I noticed some of the capsules started to get small, dark spots on them. After a bit of reading, it seems this is just oxidation and isn't harmful, but it can be a little off-putting to see your supplements changing color. It hasn't stopped me from taking them, but it's something to be aware of. I'll likely buy them again, but I might try storing them in the fridge next time to see if it helps.
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Reviewed in the United States on August 8, 2025 by KCSP20489
Size: 250 Count (Pack of 1)
Style: Supplements
*Overview* In a few words, I can say that this supplement is the closest supplement I've ever used to a miracle product. Why do I say that? As a precursor to glutathione (Coined “The Mother of All Antioxidants” by Mark Hyman, MD), NAC serves to help my body overcome environmental and dietary toxins. In brief, I no longer feel "sluggish" like I once did or experience hangovers (even from minimal alcohol) like I once did. Since taking 1200-1800mg/day (2-3 capsules) in September of 2015, this has become a (long-awaited) staple in my supplement drawer and boost to my overall health. I am never without this product. *Dosage* I take, like I said, 2-3 capsules a day. First thing in the morning on an empty stomach with a large glass of water. Second one around lunchtime. Third one middle of the afternoon or so. If I plan on going out for a few drinks in the evening, I take another one before heading out the door to spend time with friends. I rarely miss doses but if I do, it is not as if my whole system crashes or I feel I have become so dependent on it I cannot function or am worse off than when I started. *What does it do?* If you're interested in the breakdown of what exactly this product is meant to do, I would recommend your own research or read some of the other reviews. I merely want to offer my own experience. I have taken a variety of supplements since I was a teenager (15+ years) and never really felt that most products lived up the hype or could back up their claims. As a former smoker, I stumbled across this product while researching "What products help mitigate lung damage from smoking" and found this on a random forum buried somewhere in the text. That's where I first encountered the name NAC. I was skeptical and more than a little nervous about taking it but was somewhat assured when I read this is used in hospitals for acetaminophen overdoses so, if used by the medical community, maybe there was something to it? The effect was initially subtle. I was bursting with energy or bouncing off walls but found certain things that used to be VERY hard for me started to lift. A few examples. I found myself picking up the phone more often and calling a friend where before I felt a dark lining on life that made it harder to be myself. I found myself breathing easier and experiencing less sinus pressure (which makes sense as this thins out mucus) which was hugely helpful as I am allergic to most everything and experience an overload. It didn't take all allergy symptoms away, but my need for anti-allergy meds has decreased. In fact, I can't remember the last time I bought a bottle of allegra. I found myself able to better focus in class and while I still experience a certain level of brain fog from time to time, clarity of thought is more the norm for me than the exception. This has corresponded to a lifting of a sense of depression and darkness making it easier to be myself in social situations (and move past the worst parts of social anxiety). Last, but certainly not least, I process alcohol WAY faster. I can't explain the effect but, like most adults, I have a drink from time to time. Like some adults, I have nights where I have more than one drink from time to time. Unlike most adults after a night of drinking, I don't have concerns for how I'll feel the next day. I can feel the effect even at the bar where I remain lucid and focused while drinking as opposed to becoming...sloppy? In the last year I've woken up with a headache once as opposed to formerly experiencing a headache after 1 beer. So...it seems to be doing something... Like I said, I cannot recommend this product enough and continue to share my experience with everyone I encounter. While I continue to experiment with other supplements, adding or removing items for specific things, NAC remains a baseline of health for me and will not go without. No, my hair has not fallen out (as another reviewer mentioned they experienced). No, this product will not allow you to drink like a monster without effect at all. Qualifiers aside, this product might help you and would be worth considering if you've tried everything out there (like me) and want a good baseline for health to continue to build upon. Best of luck in your search for better health! *edited 10/06/16 for clarity.*
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Reviewed in the United States on July 4, 2016 by Kevin James
Size: 100 Count (Pack of 1)
Style: Supplements
This stuff is amazing! My husband and I have both been taking it for the last 4 days and he hasn’t suffered from a night terror since! He has struggled with them since he was a child. I highly recommend this supplement to knock the edge off! Great for hangovers too
Reviewed in the United States on January 12, 2026 by Tammy B
Size: 100 Count (Pack of 1)
Style: Supplements
Great product. Be careful about using too much at once or it will bulk up in your glass and be undrinkable. A tablespoon ful in a glass of water is about right.
Reviewed in the United States on January 4, 2026 by B. Sharp